To compare the structure of a raspberry with that of a strawberry is a very instructive botanical study. It shows how similar causes may produce the same gross result in singularly different ways. Both are roses by family, and both have flowers essentially17 similar to that of the common dog-rose. But even in plants where the flowers are alike, the fruits often differ conspicuously19, because fresh principles come into play for the dispersion and safe germination20 of the seed. This makes the study of fruits the most complicated part in the unravelling21 of plant life. After the strawberry has blossomed, the pulpy23 receptacle on which it bore its green fruitlets begins to swell24 and redden, till at length it grows into an edible25 berry, dotted with little yellow nuts, containing each a single seed. But in the raspberry it is the separate fruitlets themselves which grow soft and bright-coloured, while the receptacle remains26 white and tasteless, forming the 'hull27' which we pull off from the berry when we are going to eat it. Thus the part of the raspberry which we throw away answers to the part of the strawberry which we eat. Only, in the raspberry the separate fruitlets are all crowded close together into a single united mass, while in the strawberry they are scattered28 about loosely, and embedded29 in the soft flesh of the receptacle. The blackberry is another close relative; but in its fruit the little pulpy fruitlets cling to the receptacle, so that we pick and eat them both together; whereas in the raspberry the receptacle pulls out easily, and leaves a thimble-shaped hollow in the middle of the berry. Each of these little peculiarities30 has a special meaning of its own in the history of the different plants.
Yet the main object attained31 by all is in the end precisely32 similar. Strawberries, raspberries, and blackberries all belong to the class of attractive fruits. They survive in virtue14 of the attention paid to them by birds and small animals. Just as the wild strawberry which I picked in the hedgerow the other day procures33 the dispersion of its hard and indigestible fruitlets by getting them eaten together with the pulpy receptacle, so does the raspberry procure34 the dispersion of its soft and sugary fruitlets by getting them eaten all by themselves. While the strawberry fruitlets retain throughout their dry outer coating, in those of the raspberry the external covering becomes fleshy and red, but the inner seed has, notwithstanding, a still harder shell than the tiny nuts of the strawberry. Now, this is the secret of nine fruits out of ten. They are really nuts, which clothe themselves in an outer tunic35 of sweet and beautifully coloured pulp22. The pulp, as it were, the plant gives in, as an inducement to the friendly bird to swallow its seed; but the seed itself it protects by a hard stone or shell, and often by poisonous or bitter juices within. We see this arrangement very conspicuously in a plum, or still better in a mango; though it is really just as evident in the raspberry, where the smaller size renders it less conspicuous18 to human sight.
It is a curious fact about the rose family that they have a very marked tendency to produce such fleshy fruits, instead of the mere dry seed-vessels of ordinary plants, which are named fruits only by botanical courtesy. For example, we owe to this single family the peach, plum, apricot, cherry, damson, pear, apple, medlar, and quince, all of them cultivated in gardens or orchards36 for their fruits. The minor37 group known by the poetical38 name of Dryads, alone supplies us with the strawberry, raspberry, blackberry, and dewberry. Even the wilder kinds, refused as food by man, produce berries well known to our winter birds—the haw, rose-hip, sloe, bird-cherry, and rowan. On the other hand, the whole tribe numbers but a single thoroughgoing nut—the almond; and even this nut, always somewhat soft-shelled and inclined to pulpiness39, has produced by a 'sport' the wholly fruit-like nectarine. The odd thing about the rose tribe, however, is this: that the pulpy tendency shows itself in very different parts among the various species. In the plum it is the outer covering of the true fruit which grows soft and coloured: in the apple it is a swollen40 mass of the fruit-stalk surrounding the ovules: in the rose-hip it is the hollowed receptacle: and in the strawberry it is the same receptacle, bulging41 out in the opposite direction. Such a general tendency to display colour and collect sugary juices in so many diverse parts may be compared to the general bulbous tendency of the tiger-lily or the onion, and to the general succulent tendency of the cactus42 or the house-leek. In each case, the plant benefits by it in one form or another; and whichever form happens to get the start in any particular instance is increased and developed by natural selection, just as favourable43 varieties of fruits or flowers are increased and developed in cultivated species by our own gardeners.
Sweet juices and bright colours, however, could be of no use to a plant till there were eyes to see and tongues to taste them. A pulpy fruit is in itself a mere waste of productive energy to its mother, unless the pulpiness aids in the dispersion and promotes the welfare of the young seedlings44. Accordingly, we might naturally expect that there would be no fruit-bearers on the earth until the time when fruit-eaters, actual or potential, arrived upon the scene: or, to put it more correctly, both must inevitably45 have developed simultaneously46 and in mutual47 dependence48 upon one another. So we find no traces of succulent fruits even in so late a formation as that of these lias or cretaceous cliffs. The birds of that day were fierce-toothed carnivores, devouring49 the lizards50 and saurians of the rank low-lying sea-marshes: the mammals were mostly prim51?val kangaroos or low ancestral wombats52, gentle herbivores, or savage53 marsupial54 wolves, like the Tasmanian devil of our own times. It is only in the very modern tertiary period, whose soft muddy deposits have not yet had time to harden under superincumbent pressure into solid stone, that we find the earliest traces of the rose family, the greatest fruit-bearing tribe of our present world. And side by side with them we find their clever arboreal55 allies, the ancestral monkeys and squirrels, the primitive56 robins57, and the yet shadowy forefathers58 of our modern fruit-eating parrots. Just as bees and butterflies necessarily trace back their geological history only to the time of the first honey-bearing flowers, and just as the honey-bearing flowers in turn trace back their pedigree only to the date of the rudest and most unspecialised honey-sucking insects, so are fruits and fruit-eaters linked together in origin by the inevitable59 bond of a mutual dependence. No bee, no honey; and no honey, no bee: so, too, no fruit, no fruit-bird; and no fruit-bird, no fruit.
点击收听单词发音
1 mere | |
adj.纯粹的;仅仅,只不过 | |
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2 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 | |
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3 cascades | |
倾泻( cascade的名词复数 ); 小瀑布(尤指一连串瀑布中的一支); 瀑布状物; 倾泻(或涌出)的东西 | |
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4 shingly | |
adj.小石子多的 | |
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5 defensive | |
adj.防御的;防卫的;防守的 | |
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6 armour | |
(=armor)n.盔甲;装甲部队 | |
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7 spines | |
n.脊柱( spine的名词复数 );脊椎;(动植物的)刺;书脊 | |
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8 serried | |
adj.拥挤的;密集的 | |
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9 intrusive | |
adj.打搅的;侵扰的 | |
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10 robust | |
adj.强壮的,强健的,粗野的,需要体力的,浓的 | |
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11 bleak | |
adj.(天气)阴冷的;凄凉的;暗淡的 | |
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12 stony | |
adj.石头的,多石头的,冷酷的,无情的 | |
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13 cultivation | |
n.耕作,培养,栽培(法),养成 | |
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14 virtue | |
n.德行,美德;贞操;优点;功效,效力 | |
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15 virtues | |
美德( virtue的名词复数 ); 德行; 优点; 长处 | |
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16 quaint | |
adj.古雅的,离奇有趣的,奇怪的 | |
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17 essentially | |
adv.本质上,实质上,基本上 | |
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18 conspicuous | |
adj.明眼的,惹人注目的;炫耀的,摆阔气的 | |
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19 conspicuously | |
ad.明显地,惹人注目地 | |
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20 germination | |
n.萌芽,发生;萌发;生芽;催芽 | |
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21 unravelling | |
解开,拆散,散开( unravel的现在分词 ); 阐明; 澄清; 弄清楚 | |
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22 pulp | |
n.果肉,纸浆;v.化成纸浆,除去...果肉,制成纸浆 | |
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23 pulpy | |
果肉状的,多汁的,柔软的; 烂糊; 稀烂 | |
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24 swell | |
vi.膨胀,肿胀;增长,增强 | |
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25 edible | |
n.食品,食物;adj.可食用的 | |
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26 remains | |
n.剩余物,残留物;遗体,遗迹 | |
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27 hull | |
n.船身;(果、实等的)外壳;vt.去(谷物等)壳 | |
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28 scattered | |
adj.分散的,稀疏的;散步的;疏疏落落的 | |
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29 embedded | |
a.扎牢的 | |
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30 peculiarities | |
n. 特质, 特性, 怪癖, 古怪 | |
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31 attained | |
(通常经过努力)实现( attain的过去式和过去分词 ); 达到; 获得; 达到(某年龄、水平、状况) | |
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32 precisely | |
adv.恰好,正好,精确地,细致地 | |
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33 procures | |
v.(努力)取得, (设法)获得( procure的第三人称单数 );拉皮条 | |
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34 procure | |
vt.获得,取得,促成;vi.拉皮条 | |
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35 tunic | |
n.束腰外衣 | |
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36 orchards | |
(通常指围起来的)果园( orchard的名词复数 ) | |
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37 minor | |
adj.较小(少)的,较次要的;n.辅修学科;vi.辅修 | |
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38 poetical | |
adj.似诗人的;诗一般的;韵文的;富有诗意的 | |
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39 pulpiness | |
纸浆质; 果肉性; 浆壮; 软糊壮 | |
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40 swollen | |
adj.肿大的,水涨的;v.使变大,肿胀 | |
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41 bulging | |
膨胀; 凸出(部); 打气; 折皱 | |
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42 cactus | |
n.仙人掌 | |
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43 favourable | |
adj.赞成的,称赞的,有利的,良好的,顺利的 | |
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44 seedlings | |
n.刚出芽的幼苗( seedling的名词复数 ) | |
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45 inevitably | |
adv.不可避免地;必然发生地 | |
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46 simultaneously | |
adv.同时发生地,同时进行地 | |
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47 mutual | |
adj.相互的,彼此的;共同的,共有的 | |
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48 dependence | |
n.依靠,依赖;信任,信赖;隶属 | |
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49 devouring | |
吞没( devour的现在分词 ); 耗尽; 津津有味地看; 狼吞虎咽地吃光 | |
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50 lizards | |
n.蜥蜴( lizard的名词复数 ) | |
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51 prim | |
adj.拘泥形式的,一本正经的;n.循规蹈矩,整洁;adv.循规蹈矩地,整洁地 | |
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52 wombats | |
n.袋熊( wombat的名词复数 ) | |
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53 savage | |
adj.野蛮的;凶恶的,残暴的;n.未开化的人 | |
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54 marsupial | |
adj.有袋的,袋状的 | |
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55 arboreal | |
adj.树栖的;树的 | |
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56 primitive | |
adj.原始的;简单的;n.原(始)人,原始事物 | |
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57 robins | |
n.知更鸟,鸫( robin的名词复数 );(签名者不分先后,以避免受责的)圆形签名抗议书(或请愿书) | |
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58 forefathers | |
n.祖先,先人;祖先,祖宗( forefather的名词复数 );列祖列宗;前人 | |
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59 inevitable | |
adj.不可避免的,必然发生的 | |
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