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ervice to the animal。 They are explicable； as far as I can see； solely from being in complete opposition or antithesis to the attitude and movements which； from intelligible causes； are assumed when a dog intends to fight； and which consequently are expressive of anger。 I request the reader to look at the four accompanying sketches； which have been given in order to recall vividly the appearance of a dog under these two states of mind。 It is； however； not a little difficult to represent affection in a dog； whilst caressing his master and wagging his tail； as the essence of
the expression lies in the continuous flexuous movements。
We will now turn to the cat。 When this animal is threatened by a dog； it arches its back in a surprising manner； erects its hair； opens its mouth and spits。 But we are not here concerned with this well…known attitude； expressive of terror combined with anger； we are concerned only with that of rage or anger。 This is not often seen； but may be observed when two cats are fighting together； and I have seen it well exhibited by a savage cat whilst plagued by a boy。 The attitude is almost exactly the same as that of a tiger disturbed and growling over its food； which every one must have beheld in menageries。 The animal assumes a crouching position； with the body extended； and the whole tail； or the tip alone； is lashed or curled from side to side。 The hair is not in the least erect。 Thus far； the attitude and movements are nearly the same as when the animal is prepared to spring on its prey； and when； no doubt； it feels savage。 But when preparing to fight； there is this difference； that the ears are closely pressed backwards； the mouth is partially opened； showing the teeth； the fore feet are occasionally struck out with protruded claws； and the animal occasionally utters a fierce growl。 （See figs。 9 and 10。） All； or almost all these actions naturally follow （as hereafter to be explained）； from the cat's manner and intention of attacking its enemy。
Let us now look at a cat in a directly opposite frame of mind； whilst feeling affectionate and caressing her master； and mark how opposite is her attitude in every respect。 She now stands upright with her back slightly arched； which makes the hair appear rather rough； but it does not bristle； her tail； instead of being extended and lashed from side to side； is held quite still and perpendicularly upwards； her ears are erect and pointed； her mouth is closed； and she rubs against her master with a purr instead of a growl。 Let it further be observed how widely different is the whole bearing of an affectionate cat from that of a dog； when with his body crouching and flexuous； his tail lowered and wagging； and ears depressed； he caresses his master。 This contrast in the attitudes and movements of these two carnivorous animals； under the same pleased and affectionate frame of mind； can be explained； as it appears to me； solely by their movements standing in complete antithesis to those which are naturally assumed； when these animals feel savage and are prepared either to fight or to seize their prey。
In these cases of the dog and cat； there is every reason to believe that the gestures both of hostility and affection are innate or inherited； for they are almost identically the same in the different races of the species； and in all the individuals of the same race； both young and old。
I will here give one other instance of antithesis in expression。 I formerly possessed a large dog； who； like every other dog； was much pleased to go out walking。 He showed his pleasure by trotting gravely before me with high steps； head much raised； moderately erected ears； and tail carried aloft but not stiffly。 Not far from my house a path branches off to the right； leading to the hot…house； which I used often to visit for a few moments； to look at my experimental plants。 This was always a great disappointment to the dog； as he did not know whether I should continue my walk； and the instantaneous and complete change of expression which came over him as soon as my body swerved in the least towards the path （and I sometimes tried this as an experiment） was laughable。 His look of dejection was known to every member of the family； and was called his _hot…house face_。 This consisted in the head drooping much； the whole body sinking a little and remaining motionless； the ears and tail falling suddenly down； but the tail was by no means wagged。 With the falling of the ears and of his great chaps； the eyes became much changed in appearance； and I fancied that they looked less bright。 His aspect was that of piteous； hopeless dejection； and it was； as I have said； laughable； as the cause was so slight。 Every detail in his attitude was in complete opposition to his former joyful yet dignified bearing； and can be explained； as it appears to me； in no other way； except through the principle of antithesis。 Had not the change been so instantaneous； I should have attributed it to his lowered spirits affecting； as in the case of man； the nervous system and circulation； and consequently the tone of his whole muscular frame； and this may have been in part the cause。
We will now consider how the principle of antithesis in expression has arisen。 With social animals； the power of intercommunication between the members of the same community；and with other species； between the opposite sexes； as well as between the young and the old； is of the highest importance to them。 This is generally effected by means of the voice； but it is certain that gestures and expressions are to a certain extent mutually intelligible。 Man not only uses inarticulate cries； gestures； and expressions； but has invented articulate language； if； indeed； the word INVENTED can be applied to a process； completed by innumerable steps； half…consciously made。 Any one who has watched monkeys will not doubt that they perfectly understand each other's gestures and expression； and to a large extent； as Rengger asserts；＇1＇ those of man。 An animal when going to attack another； or when afraid of another； often makes itself appear terrible； by erecting its hair； thus increasing the apparent bulk of its body； by showing its teeth； or brandishing its horns； or by uttering fierce sounds。
As the power of intercommunication is certainly of high service to many animals； there is no _a priori_ improbability in the supposition； that gestures manifestly of an opposite nature to those by which certain feelings are already expressed； should at first have been voluntarily employed under the influence of an opposite state of feeling。 The fact of the gestures being now innate； would be no valid objection to the belief that they were at first intentional； for if practised during many generations； they would probably at last be inherited。 Nevertheless it is more than doubtful； as we shall immediately see； whether any of the cases which come under our present head of antithesis； have thus originated。
With conventional signs which are not innate； such as those used by the deaf and dumb and by savages； the principle of opposition or antithesis has been partially brought into play。 The Cistercian monks thought it sinful to