402 THE SOLIDS. 



ternal surfaces of the body, but are continued for a certain 

 distance along several of the outlets. Thus, they occur in 

 the lower part of the anterior openings of the nares, in the 

 meatus auditorius externus, in the palpebral conjunctiva, in 

 the caruncula lachrymalis, in the vulva, and on the interior 

 surface of the prepuce. 



The sebaceous glands vary greatly in size, being, in certain 

 situations, much larger than in others, as in the eye-lids, ears, 

 nose, around the nipples, especially of the female, and on the 

 inner surface of the prepuce. 



The cells contained within the ordinary sebaceous glands 

 differ, in 110 respect, from those of the Meibomian glands 

 already described. It is in the hair or sebaceous follicles 

 that the well-known parasite, the Steatozoon Folliculorum, 

 whose economy has been so well described by Mr. Wilson, is 

 found, it being placed in these in an inverted position, the 

 head being turned inwards, as though the animalcule had 

 crept into the follicles from without. Many of the follicles 

 frequently contain more than one parasite. 



Caruncula Lachrymalis. 



The caruncula lachrymalis is usually described as formed 

 of a single large sebaceous gland : it is not so, however, but 

 is constituted of a considerable quantity of mixed fibrous 

 tissue and of blood-vessels, in the midst of which several, 

 usually four or five, distinct sebaceous glands are imbedded. 



These glands, like other sebaceous glands, also open into 

 follicles, which are certainly hair follicles, although, in the 

 human subject, they do not usually contain hairs. That they 

 are really hair follicles, however, is proved by the fact that 

 in the sheep minute hairs do constantly issue from them. 



Glands of Nipple. 



The sebaceous glands imbedded in the integument which 

 forms the areola around the nipple so conspicuous in the 

 female, differ from other sebaceous glands principally in their 

 larger size, which allows of their being readily perceived 

 without the assistance of glasses. 



