Page:Popular Science Monthly Volume 2.djvu/457

Rh from joy; and nerve-force will be generated in excess, which naturally leads to action of some kind. None of the above movements, so clearly expressive of affection, are of the least direct service 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, while caressing his master and wagging his tail, as the essence of the expression lies in the continuous flexuous movements.