HAIR. 275 



themselves run in the same oblique direction. (See Plate 

 XXVI. fig. 3.) 



The apertures of most of the follicles look downwards, and 

 hence we find in most cases that the points of the hairs, when 

 fully developed, are similarly directed. 



In addition, however, to this general arrangement and dis- 

 tribution, it will be seen that in early life the hair follicles are 

 disposed in lines, the apex of one follicle nearly touching the 

 base of the next : the lines thus described are not straight, 

 but are more or less curved, and divergent or convergent 

 after the manner of the lines upon the case of an engine- 

 turned watch : the hairs which issue from the follicles thus 

 take particular and determinate sweeps, which it is un- 

 necessary to describe in detail. 



It occasionally happens from some cause or other that 

 the hair follicles are implanted in a manner the reverse of 

 that which should obtain: this is especially seen in those 

 of the scalp of children, in whom frequently certain tufts 

 of hair grow up, and incline in a direction opposed to that of 

 the contiguous hair. This mal-disposition of the hair is the 

 source of much trouble and annoyance to anxious nurses and 

 mothers, who spend much time in endeavouring to bring the 

 refractory lock into order. 



In this endeavour there can be no question but that it is 

 possible to succeed, as is proved by the very different arrange- 

 ment which the hair of the head is made to follow in accord- 

 ance with the manner in which it is dressed. 



ERECTION OF HAIR. 



Man, to a certain extent, and many animals in a consider- 

 able degree, possess the power of erecting the hairs. This 

 power in man is limited to the hairs of the head, in many 

 animals it is much more general. 



Most persons on sudden exposure to cold, and on expe- 

 riencing of any emotion of fear or horror, feel a creeping 

 sensation pass over the head : this sensation is accompanied 



