!o 2 CEkUMINOUS GLANDS. [sect. 72. 



lines in thickness, partly presented the usual arrangement, and were partly, 

 as on the sole of the foot, disposed, almost quite horizontally, in their outer 

 portions, some of them running thus for the space of ij lines, so that in 

 horizontal sections of the epidermis they appeared, at first sight,^ as 

 entirely abnormal, horizontal canals, with a cavity 0-0015'" to 0-003'" in 

 diameter. The contents of the sweat-ducts were peculiar, and consisted, 

 without exception, of numerous white fat globules. I also observed sweat- 

 glands in the case described by Mohr of a large cavity in the lungs containing 

 hairs ; they measured as much as 0-2+'" in diameter, and were seated in a pan- 

 niculus adiposus, furnished with the ordinary fat-cells. It may be remarked 

 that the walls of the cavity, in addition to the above-mentioned fatty layer, 

 also possessed a corium with papillae and an epidermis, like the external skin. 



Method of examination. In order to examine the position of the sudo- 

 riparous glands and their excretory ducts, fine sections of the fresh or slightly 

 dried skin of the palm of the hand or sole of the foot should be prepared, 

 and made transparent by adding acetic acid or caustic soda. In macerated 

 portions of skin the cellular linings of the sudoriparous glands, with their 

 investment of connective tissue, can be pulled out from the cutis, along with 

 the epidermis, in the form of long tubes. I have not unfrequently succeeded 

 in so obtaining them in delicate parts of skin after moistening with concen- 

 trated acetic acid. The examination of the glandular coils is very easy in 

 the glands of the axilla ; in other places the skin must be dissected from 

 within, and the glands must be sought for, partly on the inner surface of the 

 cutis, partly in its meshes, which with some attention may be easily done 

 with 'success, especially on the hand, foot, and nipple. The large glands of 

 the ball of the foot of the dog, which Gurlt described, are particularly well 

 adapted for demonstration ; and still more suitable are the large glands of 

 the prepuce of the horse, and of the skin of the udder of the mare, which lie 

 quite loose in the subcutaneous tissue. In order to study the development 

 of the glands,, sections of the fresh or dried skin of the heel and palm of the 

 embryo should be made ; in embryos which have been preserved in spirit, the 

 glands can still be very well seen, if the sections are fine •; this is especially 

 the case immediately after the action of caustic soda. 



Literature. Breschet et Eoussel Be Vauzdme, in Annal. d. Sciene. Nat. 



1834, pp. 167, 321 ; Gurlt in Mull. Arch. 1835, p. 399 ; Tobien, Be Glandu- 

 larum Buctib. efferent. Dorp. 1853, p. 8. 



B.—OF THE CERUMINOUS GLANDS OF THE EAR. 

 § 72. The ceruminous glands of the ear are simple glands, of a 

 brownish colour, entirely resembling the sudoriparous glands in 

 external aspect, which exist in the external auditory meatus, but 

 not in its whole extent, being confined to its cartilaginous portion. 

 They lie here between the skin lining the passage and the cartilage, 

 or the fibrous substance which supplies its place, in a dense, subcu- 

 taneous cellular tissue, with little fat ; and form a continuous 

 yellowish-brown glandular layer, easily visible to the naked eye. 

 This layer is thickest in the inner half of the cartilaginous meatus, 

 and becomes gradually thinner and looser towards the orifice, but 

 is quite equal in extent to the cartilaginous meatus itself. 



