OF THE GLANDS OF THE SKIN. 209 



upon the muscular membrane. Now, since on the other hand, 

 in those glands which contain only a clear fluid, the epithelium 

 is always easily seen, and often presents many dark (even 

 golden yellow) pigment-granules in its cells, it may perhaps be 

 assumed, that the cells in the contents are nothing but detached 

 epithelium, and that the secretion mainly depends upon a 

 growth and continual casting off of the epithelial cells. 



[The examination of the secretion of the sudoriparous 

 glands is neither chemically nor microscopically complete. As 

 regards the former, the fact that the axillary glands secrete fat 

 and a nitrogeneous substance in large quantities, appears to 

 me interesting, since from the obvious similarity in structure 

 between these and the other sudoriparous glands, we may 

 perhaps draw some conclusions as to the secretion of the latter. 

 We already know that the ordinary perspiration contains 

 nitrogenous matters (extractive); and as Krause (1. c, p. 146) 

 has clearlv shown, fat also ; and it mav be asked whether these 

 substances do not perhaps in certain situations (e. g. hand, 

 foot) occur more abundantly, or under certain conditions 

 (local, adhesive, peculiarly odorous perspiration) increase in 

 quantity. The so-called sweat-corpuscles of Henle (1. c, pp. 915 

 and 939), that is, structures similar to the mucous corpuscles, I 

 have hitherto found neither in the sweat of man nor in the 

 smaller glands ; but I may remark that almost constantly, even 

 in the smaller sudoriparous glands, certain canals exist which 

 present no cavity, but are wholly filled with epithelial cells. 

 These appeared to me always to be near the blind end (fig. 

 79, B), whilst those which are nearer the excretory duct, almost 

 invariably exhibit a cavity O004 — 0-1'" in diameter. I con- 

 sider it therefore to be not impossible, that in the common 

 sudoriparous glands, a cellular secretion is at times formed and 

 excreted in the same manner as in the axillary glands; for from 

 what we see in the canals of the latter, it can hardly be doubted 

 that granules, nuclei, and perhaps also remains of cells, occur 

 in the sweat of the axilla. "Whether the sweat in different 

 individuals and races of men present notable differences is 

 unknown, for it is not ascertained that the different odour of 

 the cutaneous exhalation in the European and the Negro, for 

 instance, depends on the sweat or the material of the per- 



i. 14 



