XXV. THE ROOT OF THE MATTER.

Every Girton girl (vice Macaulay’s schoolboy, retired¹ from overwork)—every Girton girl knows that a well-conducted British oak “spreads its roots as far and wide through the soil beneath as it rears its boughs² above toward the air of heaven.” Every Girton girl is probably also of opinion that the British oak does this mainly or solely³ in order to fix itself by firm anchors in the soil—to withstand the battling winds and the constant pull of hostile gravitation. But what every Girton girl does not, perhaps, quite so confidently know is this—that, on the whole, the tips of the roots and the tips of the branches correspond roughly in situation with one another, so that if you were to unearth⁴ and expose the entire tree you would find it composed of two tolerably similar domes⁵ or hemispheres—one erect⁶ and a?rial, and one inverted⁷ and earth-bound, each occupying approximately equal areas, and each circumscribed⁸ by fairly equal circles.

Why should this be so? It is clear enough, of course, that in order to fasten a big tree firmly in the ground, it must have numerous large and strong foundations. But wherefore this approximate equality in the areas occupied by roots and frondage⁹? The answer is, because every large tree forms a sort of umbrella, a domed¹⁰ roof or catchment basin for the rain that falls upon it; and it has always its own peculiar¹¹ and admirably adapted arrangement for conducting all the water it intercepts¹² to certain special spots or drinking-places in the ground, where it sets the roots, and especially the rootlets, or absorbent terminals, intended to soak that water up and convey it to the branches. If you stand under an oak-tree during a summer shower—a mode of passive scientific observation for which nature has afforded quite ample opportunities during the last few weeks—you will notice at once that the round mass of its foliage¹³ acts exactly like a huge umbrella, and conducts all the rain that falls upon its surface outward and downward towards the circumference¹⁴ of the circle. The drops that alight upon the central and tallest part of the tree are shed by the veined and channelled leaves till they fall off the tips on to the layer immediately below and outside them; this layer again conveys them to the next in order, and so on, till at last a little gathering¹⁵ stream drips from the ends of the lowest and longest outward-pointing boughs on to the soil beneath them. The ground in the centre remains¹⁶ perfectly¹⁷ dry, while a circle at the circumference is hollowed into a sort of irregular trench¹⁸, or rude round of tiny pits, by the continuous dripping of the collected gutters¹⁹.

Now, of course, the plant wants to utilize²⁰ to the utmost all the rain it thus intercepts. It would be quite too silly of it to produce rootlets and absorbent terminals in the dry central space covered by the dense²¹ umbrella of foliage. But all around the circumference, and especially at the spots just under the runnels, where the water drops from the ends of the boughs, exactly as it drops from the rib-points of the silk-and-steel umbrella, the tree develops numerous minute rootlets, which suck up the rain as fast as it falls, and convey it by fixed²² pipes to the leaves and growing-points. Every tree and every large herb is thus a regular and well-organized catchment-basin, with its own mains and services; and it utilizes²³ its water-supply by a cunningly adapted system of sucking rootlets, all placed at the exact spots where they will most surely absorb the amount of water that in each case runs down to them. So much is this true that in transplanting trees foresters and nurserymen know well you must lop the roots and the branches so as to cover equal superficial areas, or else the water will not fall on the parts best adapted to receive it; for, just as the lopped branches put forth²⁴ new leaves and twigs²⁵ at the point of section, so do the lopped roots put forth new rootlets and absorbent hairs at the place where they are now most urgently needed.

Not every kind of plant, however, manages its water-supply on the self-same system. There are dodges²⁶ and devices. For herbs with leaves that spring from the rootstock alone, for example, without any visible above-ground stem, two main plans have been very widely adopted. One plan is that invented by plants like rhubarb, which have channelled leaves with grooved²⁷ leaf-stalks, conducting all the water that falls upon their surface centrally towards the root. This is the centripetal²⁸ type. Such plants resemble rather a funnel²⁹ than an umbrella. They have always a straight tap-root, like a carrot; and this tap-root gives off numerous short rootlets on every side, which absorb all the water as it trickles³⁰ down along the tapering³¹ surface of the inverted cone³². The other plan—the centrifugal type—is adopted by certain plants with heart-shaped or arrow-shaped leaves, which have round leaf-stalks. In these cases the individual leaves point outward and downward, and the water drips from them not inward towards the centre, but outward towards the circumference. Their principle is rather umbrella-like than funnel-like. To meet this catchment system they have no long and descending³³ tap-root, but just a short knobby root, which gives off long fibres radially in every direction; and these fibres terminate in knots or groups of absorbent rootlets exactly beneath the points where each leaf drips—the knobs or tags of the umbrella, to carry out our convenient metaphor³⁴. Examination of other and more complex plants reveals always the action of the same general law; each species has a peculiar catchment system of its own, more or less complicated, by means of which, directly or indirectly³⁵, all the water that falls upon its foliage is finally conducted to certain specified³⁶ spots or drinking-places; and at those specified spots the plant provides beforehand an elaborate system of absorbent organs, exactly sufficient to suck up and utilize the average amount of water it expects to obtain and store at each of them. If London were a plant, now——But hush³⁷! I am silent. A gathering frown on the reader’s brow warns me in time to steer³⁸ clear of such human and political analogies.

1 retired   

adj.隐退的，退休的，退役的

参考例句：

• The old man retired to the country for rest.这位老人下乡休息去了。
• Many retired people take up gardening as a hobby.许多退休的人都以从事园艺为嗜好。

2 boughs   

大树枝( bough的名词复数 )

参考例句：

• The green boughs glittered with all their pearls of dew. 绿枝上闪烁着露珠的光彩。
• A breeze sighed in the higher boughs. 微风在高高的树枝上叹息着。

3 solely   

adv.仅仅，唯一地

参考例句：

• Success should not be measured solely by educational achievement.成功与否不应只用学业成绩来衡量。
• The town depends almost solely on the tourist trade.这座城市几乎完全靠旅游业维持。

4 unearth   

v.发掘，掘出，从洞中赶出

参考例句：

• Most of the unearth relics remain intact.大多数出土文物仍保持完整无损。
• More human remains have been unearthed in the north.北部又挖掘出了更多的人体遗骸。

5 domes   

n.圆屋顶( dome的名词复数 )；像圆屋顶一样的东西；圆顶体育场

参考例句：

• The domes are circular or ovoid in cross-section. 穹丘的横断面为圆形或卵圆形。 来自辞典例句
• Parks. The facilities highlighted in text include sport complexes and fabric domes. 本书重点讲的设施包括运动场所和顶棚式结构。 来自互联网

6 erect   

n./v.树立，建立，使竖立；adj.直立的，垂直的

参考例句：

• She held her head erect and her back straight.她昂着头，把背挺得笔直。
• Soldiers are trained to stand erect.士兵们训练站得笔直。

7 inverted   

adj.反向的，倒转的v.使倒置，使反转( invert的过去式和过去分词 )

参考例句：

• Only direct speech should go inside inverted commas. 只有直接引语应放在引号内。
• Inverted flight is an acrobatic manoeuvre of the plane. 倒飞是飞机的一种特技动作。 来自《简明英汉词典》

8 circumscribed   

adj.[医]局限的：受限制或限于有限空间的v.在…周围划线( circumscribe的过去式和过去分词 )；划定…范围；限制；限定

参考例句：

• The power of the monarchy was circumscribed by the new law. 君主统治的权力受到了新法律的制约。
• His activities have been severely circumscribed since his illness. 自生病以来他的行动一直受到严格的限制。 来自《简明英汉词典》

9 frondage   

n.叶，茂盛的叶；叶丛；叶簇

参考例句：

10 domed   

adj. 圆屋顶的, 半球形的, 拱曲的 动词dome的过去式和过去分词形式

参考例句：

• I gazed up at the domed ceiling arching overhead. 我抬头凝望着上方弧形的穹顶。
• His forehead domed out in a curve. 他的前额呈弯曲的半球形。

11 peculiar   

adj.古怪的，异常的；特殊的，特有的

参考例句：

• He walks in a peculiar fashion.他走路的样子很奇特。
• He looked at me with a very peculiar expression.他用一种很奇怪的表情看着我。

12 intercepts   

（数学）截距( intercept的名词复数 )

参考例句：

• It intercepts a portion of the light impinging on the photocell. 它遮住一部分照射在光电管上的光。
• The pelletfilter intercepts the particulate matter. 颗粒过滤器将颗粒物进行拦截。

13 foliage   

n.叶子，树叶，簇叶

参考例句：

• The path was completely covered by the dense foliage.小路被树叶厚厚地盖了一层。
• Dark foliage clothes the hills.浓密的树叶覆盖着群山。

14 circumference   

n.圆周，周长，圆周线

参考例句：

• It's a mile round the circumference of the field.运动场周长一英里。
• The diameter and the circumference of a circle correlate.圆的直径与圆周有相互关系。

15 gathering   

n.集会，聚会，聚集

参考例句：

• He called on Mr. White to speak at the gathering.他请怀特先生在集会上讲话。
• He is on the wing gathering material for his novels.他正忙于为他的小说收集资料。

16 remains   

n.剩余物，残留物；遗体，遗迹

参考例句：

• He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
• The remains of the meal were fed to the dog.残羹剩饭喂狗了。

17 perfectly   

adv.完美地，无可非议地，彻底地

参考例句：

• The witnesses were each perfectly certain of what they said.证人们个个对自己所说的话十分肯定。
• Everything that we're doing is all perfectly above board.我们做的每件事情都是光明正大的。

18 trench   

n./v.(挖)沟，(挖)战壕

参考例句：

• The soldiers recaptured their trench.兵士夺回了战壕。
• The troops received orders to trench the outpost.部队接到命令在前哨周围筑壕加强防卫。

19 gutters   

（路边）排水沟( gutter的名词复数 )； 阴沟； （屋顶的）天沟； 贫贱的境地

参考例句：

• Gutters lead the water into the ditch. 排水沟把水排到这条水沟里。
• They were born, they grew up in the gutters. 他们生了下来，以后就在街头长大。

20 utilize   

vt.使用，利用

参考例句：

• The cook will utilize the leftover ham bone to make soup.厨师要用吃剩的猪腿骨做汤。
• You must utilize all available resources.你必须利用一切可以得到的资源。

21 dense   

a.密集的，稠密的，浓密的；密度大的

参考例句：

• The general ambushed his troops in the dense woods. 将军把部队埋伏在浓密的树林里。
• The path was completely covered by the dense foliage. 小路被树叶厚厚地盖了一层。

22 fixed   

adj.固定的，不变的，准备好的；(计算机)固定的

参考例句：

• Have you two fixed on a date for the wedding yet?你们俩选定婚期了吗？
• Once the aim is fixed,we should not change it arbitrarily.目标一旦确定，我们就不应该随意改变。

23 utilizes   

v.利用，使用( utilize的第三人称单数 )

参考例句：

• One highly successful approach utilizes a triplet aspheric lens array. 一种很成功的方法是利用一个三合非球面透镜阵列。 来自辞典例句
• The first utilizes a blend of finely ground ceramic powders. 第一种用的是一种磨细的陶瓷粉末混合物。 来自辞典例句

24 forth   

adv.向前；向外，往外

参考例句：

• The wind moved the trees gently back and forth.风吹得树轻轻地来回摇晃。
• He gave forth a series of works in rapid succession.他很快连续发表了一系列的作品。

25 twigs   

细枝，嫩枝( twig的名词复数 )

参考例句：

• Some birds build nests of twigs. 一些鸟用树枝筑巢。
• Willow twigs are pliable. 柳条很软。

26 dodges   

n.闪躲( dodge的名词复数 )；躲避；伎俩；妙计v.闪躲( dodge的第三人称单数 )；回避

参考例句：

• He tried all sorts of dodges to avoid being called up. 他挖空心思，耍弄各种花招以逃避被征召入伍。 来自《简明英汉词典》
• Those were the dodges he used to escape taxation. 那些是他用以逃税的诡计。 来自辞典例句

27 grooved   

v.沟( groove的过去式和过去分词 )；槽；老一套；（某种）音乐节奏

参考例句：

• He was grooved in running errands for his neighbors. 他已习惯于为邻居跑腿。 来自辞典例句
• The carpenter grooved the board. 木匠在木板上开槽。 来自辞典例句

28 centripetal   

adj.向心的

参考例句：

• After some treatment of centripetal force,he deduces Kepler's third law.在向心力的一些论述之后，他推出了开普勒的第三定律。
• It is called the centripetal acceleration.这叫做向心加速度。

29 funnel   

n.漏斗；烟囱；v.汇集

参考例句：

• He poured the petrol into the car through a funnel.他用一个漏斗把汽油灌入汽车。
• I like the ship with a yellow funnel.我喜欢那条有黄烟囱的船。

30 trickles   

n.细流( trickle的名词复数 )；稀稀疏疏缓慢来往的东西v.滴( trickle的第三人称单数 )；淌；使)慢慢走；缓慢移动

参考例句：

• Trickles of sweat rained down my head and neck. 我颈上头上的汗珠，更同盛雨似的，一颗一颗的钻出来了。 来自汉英文学 - 中国现代小说
• Water trickles through an underground grotto. 水沿着地下岩洞流淌。 来自辞典例句

31 tapering   

adj.尖端细的

参考例句：

• Interest in the scandal seems to be tapering off. 人们对那件丑闻的兴趣似乎越来越小了。
• Nonproductive expenditures keep tapering down. 非生产性开支一直在下降。

32 cone   

n.圆锥体，圆锥形东西，球果

参考例句：

• Saw-dust piled up in a great cone.锯屑堆积如山。
• The police have sectioned off part of the road with traffic cone.警察用锥形路标把部分路面分隔开来。

33 descending   

n. 下行 adj. 下降的

参考例句：

• The results are expressed in descending numerical order . 结果按数字降序列出。
• The climbers stopped to orient themselves before descending the mountain. 登山者先停下来确定所在的位置，然后再下山。

34 metaphor   

n.隐喻，暗喻

参考例句：

• Using metaphor,we say that computers have senses and a memory.打个比方，我们可以说计算机有感觉和记忆力。
• In poetry the rose is often a metaphor for love.玫瑰在诗中通常作为爱的象征。

35 indirectly   

adv.间接地，不直接了当地

参考例句：

• I heard the news indirectly.这消息我是间接听来的。
• They were approached indirectly through an intermediary.通过一位中间人，他们进行了间接接触。

36 specified   

adj.特定的

参考例句：

• The architect specified oak for the wood trim. 那位建筑师指定用橡木做木饰条。
• It is generated by some specified means. 这是由某些未加说明的方法产生的。

37 hush   

int.嘘，别出声；n.沉默，静寂；v.使安静

参考例句：

• A hush fell over the onlookers.旁观者们突然静了下来。
• Do hush up the scandal!不要把这丑事声张出去！

38 steer   

vt.驾驶，为…操舵；引导；vi.驾驶

参考例句：

• If you push the car, I'll steer it.如果你来推车，我就来驾车。
• It's no use trying to steer the boy into a course of action that suits you.想说服这孩子按你的方式行事是徒劳的。