This conclusion brings me to the piece of gratuitous advice I offer to the unmarried reader. It will be more likely to appeal to the woman than the man, I believe. Let such an one who is contemplating matrimony make a short study of wrinkles and the long hairs if possible--unfortunately she cannot do this of her prospective mate if he be at all young, for neither of these features will be pronounced as yet. I recommend instead a study of the wrinkles and hairs of the father and mother and a deliberate summing-up of the evidence in this way. If she wishes to have a cheery, genial, hopeful companion in life like B. W. (Fig. 26) let her seek as many arched wrinkles in his parents as possible and avoid very deep vertical wrinkles. If she be herself of that disposition she will want a mate of different qualities and may venture on one whose balance of family wrinkles inclines to the vertical, _see_ Fig. 28, R. N. She can risk that, and perhaps get a more capable and strenuous comrade in life’s battle. But let her beware of him whose wrinkles are all of the vertical kind; for he will be thoughtful, moody, abstracted and not too good-tempered. I would rather myself join my fortunes to one who could claim a large share of arched wrinkles. [Illustration: Fig. 29.--B. F. _æt_ 52. _Hairs_: On both sides much twisted downwards, producing shelf over eye. _Wrinkles_: None on forehead; strongly-marked concentric orbital wrinkles on both sides.] After this digression, which follows logically on the facts and arguments of this chapter I am now in a position to affirm that _changes in the direction of the hair in the individual can be caused by muscular action_. CHAPTER IX. HABITS AND HAIR OF UNGULATES. Horses. The Ungulate order has been variously divided by zoologists, and is still said to be composed of two main sections, even-toed and odd-toed Ungulates, with the addition of a good many “outsiders” if one may use the term. These sections form two sub-orders, and the division suits my purpose here very well. I take the odd-toed sub-order of the Ungulata Vera first. Lessons from the Domestic Horse. The domestic horse is the only member of this section that requires detailed attention, and its value for studying the direction of the mammalian hair is great, on account of the immense number of specimens available, the quality and varied distribution of its hair, the size of the animal, and, most of all, our intimate knowledge of its habits of life for many thousands of years.