PREFACE.

These Essays originally appeared in the columns of the 'St. James's Gazette,' and I have to thank the courtesy of the Editor for kind permission to republish them. My object in writing them was to make the general principles and methods of evolutionists a little more familiar to unscientific readers. Biologists usually deal with those underlying¹ points of structure which are most really important, and on which all technical discussion must necessarily be based. But ordinary people care little for such minute anatomical and physiological² details. They cannot be expected to interest themselves in the flexor pollicis longus, or the hippocampus major about whose very existence they are ignorant, and whose names suggest to them nothing but unpleasant ideas. What they want to find out is how the outward and visible forms of plants and animals were produced. They would much rather learn why birds have feathers than why they have a keeled sternum; and they think the origin of bright flowers far more attractive than the origin of monocotyledonous seeds or exogenous stems. It is with these surface questions of obvious outward appearance that I have attempted to deal in this little series. My plan is to take a simple and well-known natural object, and give such an explanation as evolutionary³ principles afford of its most striking external features. A strawberry, a snail-shell, a tadpole⁴, a bird, a wayside flower—these are the sort of things which I have tried to explain. If I have not gone very deep, I hope at least that I have suggested in simple language the right way to go to work.

I must make an apology for the form in which the essays are cast, so far as regards the apparent egotism of the first person. When they appeared anonymously⁵ in the columns of a daily paper, this air of personality was not so obtrusive⁶: now that they reappear under my own name, I fear it may prove somewhat too marked. Nevertheless, to cut out the personal pronoun would be to destroy the whole machinery⁷ of the work: so I have reluctantly decided⁸ to retain it, only begging the reader to bear in mind that the I of the essays is not a real personage, but the singular number of the editorial we.

I have made a few alterations⁹ and corrections in some of the papers, so as to bring the statements into closer accordance with scientific accuracy. At the same time, I should like to add that I have intentionally¹⁰ simplified the scientific facts as far as possible. Thus, instead of saying that the groundsel is a composite, I have said that it is a daisy by family; and instead of saying that the ascidian larva belongs to the sub-kingdom Chordata, I have said that it is a first cousin of the tadpole. For these simplifications, I hope technical biologists will pardon me. After all, if you wish to be understood, it is best to speak to people in words whose meanings they know. Definite and accurate terminology¹¹ is necessary to express definite and accurate knowledge; but one may use vague expressions where the definite ones would convey no ideas.

I have to thank the kindness of my friend the Rev¹². E. Purcell, of Lincoln College, Oxford¹³, for the clever and appropriate design which appears upon the cover.

G. A.

1 underlying   

adj.在下面的，含蓄的，潜在的

参考例句：

• The underlying theme of the novel is very serious.小说隐含的主题是十分严肃的。
• This word has its underlying meaning.这个单词有它潜在的含义。

2 physiological   

adj.生理学的，生理学上的

参考例句：

• He bought a physiological book.他买了一本生理学方面的书。
• Every individual has a physiological requirement for each nutrient.每个人对每种营养成分都有一种生理上的需要。

3 evolutionary   

adj.进化的；演化的，演变的；[生]进化论的

参考例句：

• Life has its own evolutionary process.生命有其自身的进化过程。
• These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。

4 tadpole   

n.[动]蝌蚪

参考例句：

• As a tadpole changes into a frog,its tail is gradually absorbed.蝌蚪变成蛙，它的尾巴就逐渐被吸收掉。
• It was a tadpole.Now it is a frog.它过去是蝌蚪，现在是一只青蛙。

5 anonymously   

ad.用匿名的方式

参考例句：

• The manuscripts were submitted anonymously. 原稿是匿名送交的。
• Methods A self-administered questionnaire was used to survey 536 teachers anonymously. 方法采用自编“中小学教师职业压力问卷”对536名中小学教师进行无记名调查。

6 obtrusive   

adj.显眼的；冒失的

参考例句：

• These heaters are less obtrusive and are easy to store away in the summer.这些加热器没那么碍眼，夏天收起来也很方便。
• The factory is an obtrusive eyesore.这工厂很刺眼。

7 machinery   

n.(总称)机械，机器；机构

参考例句：

• Has the machinery been put up ready for the broadcast?广播器材安装完毕了吗？
• Machinery ought to be well maintained all the time.机器应该随时注意维护。

8 decided   

adj.决定了的，坚决的；明显的，明确的

参考例句：

• This gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
• There is a decided difference between British and Chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。

9 alterations   

n.改动( alteration的名词复数 )；更改；变化；改变

参考例句：

• Any alterations should be written in neatly to the left side. 改动部分应书写清晰，插在正文的左侧。 来自《简明英汉词典》
• Gene mutations are alterations in the DNA code. 基因突变是指DNA 密码的改变。 来自《简明英汉词典》

10 intentionally   

ad.故意地，有意地

参考例句：

• I didn't say it intentionally. 我是无心说的。
• The local authority ruled that he had made himself intentionally homeless and was therefore not entitled to be rehoused. 当地政府裁定他是有意居无定所，因此没有资格再获得提供住房。

11 terminology   

n.术语；专有名词

参考例句：

• He particularly criticized the terminology in the document.他特别批评了文件中使用的术语。
• The article uses rather specialized musical terminology.这篇文章用了相当专业的音乐术语。

12 rev   

v.发动机旋转，加快速度

参考例句：

• It's his job to rev up the audience before the show starts.他要负责在表演开始前鼓动观众的热情。
• Don't rev the engine so hard.别让发动机转得太快。

13 Oxford   

n.牛津（英国城市）

参考例句：

• At present he has become a Professor of Chemistry at Oxford.他现在已是牛津大学的化学教授了。
• This is where the road to Oxford joins the road to London.这是去牛津的路与去伦敦的路的汇合处。