GLANDS. 399 



are stated to be absent, viz., the palms of the hands and 

 the soles of the feet. On all other surfaces of the body 

 the two kinds of glands are constantly associated together, 

 the sudoriferous being much more numerous than the seba- 

 ceous glands. 



They are found especially more or less deeply imbedded in 

 those portions of integument which are copiously clothed with 

 hair, as the scalp, whiskers, beard, axilla, pubis, scrotum, and 

 perineum. They also exist, however, in abundance in certain 

 situations not usually invested with hair, as in the integument 

 of the forehead, face, and nose, in the meatus auditorius ex- 

 ternus of the ear, and for a certain distance up the anterior 

 openings of the nares : those situated around the nipple of 

 the female are particularly large, while those of the prepuce 

 are not merely of considerable size, but yield a solid and 

 unctuous secretion of a peculiar and penetrating odour. 



Those glands which exist in situations which are naturally 

 clothed with hair always open into the hair follicles, while 

 those present in parts not furnished with such a covering, yet 

 nevertheless open into follicles which, although from the ab- 

 sence of hairs they cannot be called hair follicles, must yet not 

 be regarded as essentially distinct from hair follicles, since they 

 in some cases do really contain hairs. 



As there are varieties of sebaceous matter, so are there 

 sebaceous glands which differ structurally from each other ; 

 thus the cerumen glands of the ear present a conformation 

 typically distinct from all other sebaceous glands, belonging 

 to the tubular type of glands, with which they will be de- 

 scribed. 



There are characters, however, in the possession of which 

 all sebaceous glands agree, save, perhaps, the cerumen glands, 

 and these are in the semi-solid nature of their secretion and 

 in the mode of its formation and elimination. 



The secretion of the sebaceous glands, like other secretions, 

 is formed within the cells, which are very large, and in which 

 it exists in the form of little spherical and shining particles 

 of various sizes ; these cells, when filled with the secreted 

 matter, are thrown off without rupture from the glands in 



K K 



