THE DUST WE HAVE TO BREATHE.

A microscopist, Mr. Dancer, F.R.A.S., has been examining the dust of our cities. The results are not pleasing. We had always recognised city dust as a nuisance, and had supposed that it derived¹ the peculiar² grittiness and flintiness of its structure from the constant macadamizing of city roads. But it now appears that the effects produced by dust, when, as is usual, it finds its way to our eyes, our nostrils³, and our throats, are as nothing compared with the mischief⁴ it is calculated to produce in a more subtle manner. In every specimen⁵ examined by Mr. Dancer animal life was abundant. But the amount of ‘molecular⁶ activity’—such is the euphuism under which what is exceedingly disagreeable to contemplate⁷ is spoken about—is variable according to the height at which the dust is collected. And of all heights which these molecular wretches⁸ could select for the display of their activity, the height of five feet is that which has been found to be the favourite. Just at the average height of the foot-passenger’s mouth these moving organisms are always waiting to be devoured⁹ and to make us ill. And this is not all. As if animal abominations were insufficient¹⁰, a large proportion of vegetable matter also disports¹¹ itself in the light dust of our streets. The observations show that in thoroughfares where there are many animals engaged in the traffic, the greater part of the vegetable matter thus floating about266 ‘consists of what has passed through the stomachs of animals,’ or has suffered decomposition¹² in some way or other. This unpleasing matter, like the ‘molecular activity,’ floats about at a height of five feet, or thereabouts.

After this, one begins to recognise the manner in which some diseases propagate themselves. What had been mysterious in the history of plagues and pestilences¹³ seems to receive at least a partial solution. Take cholera¹⁴, for example. It has been shown by the clearest and most positive evidence that this disease is not propagated in any way save one—that is, by the actual swallowing of the cholera poison. In Professor Thudichum’s masterly paper on the subject in the ‘Monthly Microscopical¹⁵ Journal,’ it is stated that doctors have inhaled¹⁶ a full breathing from a person in the last stage of this terrible malady¹⁷ without any evil effects. Yet the minutest atom of the cholera poison received into the stomach will cause an attack of cholera. A small quantity of this matter drying on the floor of the patient’s room, and afterwards caused to float about in the form of dust, would suffice to prostrate¹⁸ a houseful of people. We can understand, then, how matter might be flung into the streets, and, after drying, its dust be wafted¹⁹ through a whole district, causing the death of hundreds. One of the lessons to be learned from these interesting researches of Mr. Dancer is clearly this, that the watering-cart should be regarded as one of the most important of our hygienic institutions. Supplemented by careful scavengering, it267 might be effective in dispossessing many a terrible malady which now holds sway from time to time over our towns.

(From the Daily News, March 6, 1869.)

1 derived   

vi.起源；由来；衍生；导出v.得到( derive的过去式和过去分词 )；（从…中）得到获得；源于；（从…中）提取

参考例句：

• Many English words are derived from Latin and Greek. 英语很多词源出于拉丁文和希腊文。 来自《简明英汉词典》
• He derived his enthusiasm for literature from his father. 他对文学的爱好是受他父亲的影响。 来自《简明英汉词典》

2 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。

3 nostrils   

鼻孔( nostril的名词复数 )

参考例句：

• Her nostrils flared with anger. 她气得两个鼻孔都鼓了起来。
• The horse dilated its nostrils. 马张大鼻孔。

4 mischief   

n.损害，伤害，危害；恶作剧，捣蛋，胡闹

参考例句：

• Nobody took notice of the mischief of the matter. 没有人注意到这件事情所带来的危害。
• He seems to intend mischief.看来他想捣蛋。

5 specimen   

n.样本，标本

参考例句：

• You'll need tweezers to hold up the specimen.你要用镊子来夹这标本。
• This specimen is richly variegated in colour.这件标本上有很多颜色。

6 molecular   

adj.分子的；克分子的

参考例句：

• The research will provide direct insight into molecular mechanisms.这项研究将使人能够直接地了解分子的机理。
• For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时，分子的碰撞就停止了。

7 contemplate   

vt.盘算，计议；周密考虑；注视，凝视

参考例句：

• The possibility of war is too horrifying to contemplate.战争的可能性太可怕了，真不堪细想。
• The consequences would be too ghastly to contemplate.后果不堪设想。

8 wretches   

n.不幸的人( wretch的名词复数 )；可怜的人；恶棍；坏蛋

参考例句：

• The little wretches were all bedraggledfrom some roguery. 小淘气们由于恶作剧而弄得脏乎乎的。 来自《现代英汉综合大词典》
• The best courage for us poor wretches is to fly from danger. 对我们这些可怜虫说来，最好的出路还是躲避危险。 来自辞典例句

9 devoured   

吞没( devour的过去式和过去分词 )； 耗尽； 津津有味地看； 狼吞虎咽地吃光

参考例句：

• She devoured everything she could lay her hands on: books, magazines and newspapers. 无论是书、杂志，还是报纸，只要能弄得到，她都看得津津有味。
• The lions devoured a zebra in a short time. 狮子一会儿就吃掉了一匹斑马。

10 insufficient   

adj.(for，of)不足的，不够的

参考例句：

• There was insufficient evidence to convict him.没有足够证据给他定罪。
• In their day scientific knowledge was insufficient to settle the matter.在他们的时代，科学知识还不能足以解决这些问题。

11 disports   

v.嬉戏，玩乐，自娱( disport的第三人称单数 )

参考例句：

• What ardent, imaginative soul has not a secret pleasureplace in which it disports? 热情奔放，耽于冥想的心灵，怎么会没有一个供它嬉戏的秘密乐园呢？ 来自辞典例句

12 decomposition   

n. 分解, 腐烂, 崩溃

参考例句：

• It is said that the magnetite was formed by a chemical process called thermal decomposition. 据说这枚陨星是在热分解的化学过程中形成的。
• The dehydration process leads to fairly extensive decomposition of the product. 脱水过程会导致产物相当程度的分解。

13 pestilences   

n.瘟疫， （尤指）腺鼠疫( pestilence的名词复数 )

参考例句：

• The Black Death is one the most serious pestilences in history. 黑死病是人类历史上众多瘟疫中危害很大的瘟疫之一，它是中世纪历史上的一次惨重的生态灾难。 来自互联网

14 cholera   

n.霍乱

参考例句：

• The cholera outbreak has been contained.霍乱的发生已被控制住了。
• Cholera spread like wildfire through the camps.霍乱在营地里迅速传播。

15 microscopical   

adj.显微镜的，精微的

参考例句：

• Methods: The microscopical identification and TLC were adopted to analyze Senchensan. 方法采用显微鉴别法与薄层色谱法对三臣散进行定性鉴别。 来自互联网
• Methods: The microscopical identification and quality identification were studied by TLC. 方法：对健胃整肠丸进行了显微鉴定，薄层色谱鉴别。 来自互联网

16 inhaled   

v.吸入( inhale的过去式和过去分词 )

参考例句：

• She closed her eyes and inhaled deeply. 她合上双眼，深深吸了一口气。
• Janet inhaled sharply when she saw him. 珍妮特看到他时猛地吸了口气。 来自《简明英汉词典》

17 malady   

n.病，疾病(通常做比喻)

参考例句：

• There is no specific remedy for the malady.没有医治这种病的特效药。
• They are managing to control the malady into a small range.他们设法将疾病控制在小范围之内。

18 prostrate   

v.拜倒，平卧，衰竭；adj.拜倒的，平卧的，衰竭的

参考例句：

• She was prostrate on the floor.她俯卧在地板上。
• The Yankees had the South prostrate and they intended to keep It'so.北方佬已经使南方屈服了,他们还打算继续下去。

19 wafted   

v.吹送，飘送，（使）浮动( waft的过去式和过去分词 )

参考例句：

• The sound of their voices wafted across the lake. 他们的声音飘过湖面传到了另一边。
• A delicious smell of freshly baked bread wafted across the garden. 花园中飘过一股刚出炉面包的香味。 来自《简明英汉词典》