Book v chapter 6

Of animals some are uni-coloured (I mean by this term those of which the kind as a whole has one colour, as all lions are tawny¹; and this condition exists also in birds, fish, and the other classes of animals alike); others though many-coloured are yet whole-coloured (I mean those whose body as a whole has the same colour, as a bull is white as a whole or dark as a whole); others are vari-coloured. This last term is used in both ways; sometimes the whole kind is vari-coloured, as leopards² and peacocks, and some fish, e.g. the so-called ‘thrattai’; sometimes the kind as a whole is not so, but such individuals are found in it, as with cattle and goats and, among birds, pigeons; the same applies also to other kinds of birds. The whole-coloured change much more than the uniformly coloured, both into the simple colour of another individual of the same kind (as dark changing into white and vice³ versa) and into both colours mingled⁴. This is because it is a natural characteristic of the kind as a whole not to have one colour only, the kind being easily moved in both directions so that the colours both change more into one another and are more varied⁵. The opposite holds with the uniformly coloured; they do not change except by an affection of the colour, and that rarely; but still they do so change, for before now white individuals have been observed among partridges, ravens⁶, sparrows, and bears. This happens when the course of development is perverted⁷, for what is small is easily spoilt and easily moved, and what is developing is small, the beginning of all such things being on a small scale.

Change is especially found in those animals of which by nature the individual is whole-coloured but the kind many-coloured. This is owing to the water which they drink, for hot waters make the hair white, cold makes it dark, an effect found also in plants. The reason is that the hot have more air than water in them, and the air shining through causes whiteness, as also in froth. As, then, skins which are white by reason of some affection differ from those white by nature, so also in the hair the whiteness due to disease or age differs from that due to nature in that the cause is different; the latter are whitened by the natural heat, the former by the external heat. Whiteness is caused in all things by the vaporous air imprisoned⁸ in them. Hence also in all animals not uniformly coloured all the part under the belly⁹ is whiter. For practically all white animals are both hotter and better flavoured for the same reason; the concoction¹⁰ of their nutriment makes them well-flavoured, and heat causes the concoction. The same cause holds for those animals which are uniformly-coloured, but either dark or white; heat and cold are the causes of the nature of the skin and hair, each of the parts having its own special heat.

The tongue also varies in colour in the simply coloured as compared with the vari-coloured animals, and again in the simply coloured which differ from one another, as white and dark. The reason is that assigned before, that the skins of the vari-coloured are vari-coloured, and the skins of the white-haired and dark-haired are white and dark in each case. Now we must conceive of the tongue as one of the external parts, not taking into account the fact that it is covered by the mouth but looking on it as we do on the hand or foot; thus since the skin of the vari-coloured animals is not uniformly coloured, this is the cause of the skin on the tongue being also vari-coloured.

Some birds and some wild quadrupeds change their colour according to the seasons of the year. The reason is that, as men change according to their age, so the same thing happens to them according to the season; for this makes a greater difference to them than the change of age.

The more omnivorous¹¹ animals are more vari-coloured to speak generally, and this is what might be expected; thus bees are more uniformly coloured than hornets and wasps¹². For if the food is responsible for the change we should expect varied food to increase the variety in the movements which cause the development and so in the residual¹³ matter of the food, from which come into being hairs and feathers and skins.

So much for colours and hairs.

1 tawny   

adj.茶色的，黄褐色的；n.黄褐色

参考例句：

• Her black hair springs in fine strands across her tawny,ruddy cheek.她的一头乌发分披在健康红润的脸颊旁。
• None of them noticed a large,tawny owl flutter past the window.他们谁也没注意到一只大的、褐色的猫头鹰飞过了窗户。

2 leopards   

n.豹( leopard的名词复数 )；本性难移

参考例句：

• Lions, tigers and leopards are all cats. 狮、虎和豹都是猫科动物。 来自《简明英汉词典》
• For example, airlines never ship leopards and canaries on the same flight. 例如，飞机上从来不会同时运送豹和金丝雀。 来自英语晨读30分（初三）

3 vice   

n.坏事；恶习；[pl.]台钳，老虎钳；adj.副的

参考例句：

• He guarded himself against vice.他避免染上坏习惯。
• They are sunk in the depth of vice.他们堕入了罪恶的深渊。

4 mingled   

混合，混入( mingle的过去式和过去分词 )； 混进，与…交往[联系]

参考例句：

• The sounds of laughter and singing mingled in the evening air. 笑声和歌声交织在夜空中。
• The man and the woman mingled as everyone started to relax. 当大家开始放松的时候，这一男一女就开始交往了。

5 varied   

adj.多样的，多变化的

参考例句：

• The forms of art are many and varied.艺术的形式是多种多样的。
• The hotel has a varied programme of nightly entertainment.宾馆有各种晚间娱乐活动。

6 ravens   

n.低质煤；渡鸦( raven的名词复数 )

参考例句：

• Wheresoever the carcase is,there will the ravens be gathered together. 哪里有死尸，哪里就有乌鸦麇集。 来自《简明英汉词典》
• A couple of ravens croaked above our boat. 两只乌鸦在我们小船的上空嘎嘎叫着。 来自辞典例句

7 perverted   

adj.不正当的v.滥用( pervert的过去式和过去分词 )；腐蚀；败坏；使堕落

参考例句：

• Some scientific discoveries have been perverted to create weapons of destruction. 某些科学发明被滥用来生产毁灭性武器。
• sexual acts, normal and perverted 正常的和变态的性行为

8 imprisoned   

下狱，监禁( imprison的过去式和过去分词 )

参考例句：

• He was imprisoned for two concurrent terms of 30 months and 18 months. 他被判处30个月和18个月的监禁，合并执行。
• They were imprisoned for possession of drugs. 他们因拥有毒品而被监禁。

9 belly   

n.肚子，腹部；(像肚子一样)鼓起的部分，膛

参考例句：

• The boss has a large belly.老板大腹便便。
• His eyes are bigger than his belly.他眼馋肚饱。

10 concoction   

n.调配(物)；谎言

参考例句：

• She enjoyed the concoction of foreign dishes.她喜欢调制外国菜。
• His story was a sheer concoction.他的故事实在是一纯属捏造之事。

11 omnivorous   

adj.杂食的

参考例句：

• Brown bears are omnivorous,eating anything that they can get their paws on.棕熊是杂食性动物，抓到什么吃什么。
• Man is an omnivorous animal.人是肉类与蔬菜均食用的动物。

12 wasps   

黄蜂( wasp的名词复数 )； 胡蜂； 易动怒的人； 刻毒的人

参考例句：

• There's a wasps' nest in that old tree. 那棵老树上有一个黄蜂巢。
• We live in dread not only of unpleasant insects like spiders or wasps, but of quite harmless ones like moths. 我们不仅生活在对象蜘蛛或黄蜂这样的小虫的惧怕中，而且生活在对诸如飞蛾这样无害昆虫的惧怕中

13 residual   

adj.复播复映追加时间；存留下来的，剩余的

参考例句：

• There are still a few residual problems with the computer program.电脑程序还有一些残留问题。
• The resulting residual chromatism is known as secondary spectrum.所得到的剩余色差叫做二次光谱。