SECT. 69.] SUDORirAROUS GLANDS. 127 



abdomen, as well as the first two segments of the upper extremities, 

 have delicate walls, and arc destitute of muscles. 



The diameter of the glandular canals varies, in the smaller 

 glands, from 0*022'" to 0-04'", and amounts, on an average, to 0-03'" ; 

 the thickness of the walls 0002'" to 0-003'", tne epithelium 0-006'", 

 and the cavity 0-004'" to o'oi.'" Some of the glands of the axilla 

 possess canals of 0-07'" to O'l/" and even 0-15'" in diameter, with 

 walls (without reckoning the epithelium) of 0-006'" thick, of which 

 the half belongs to the muscular layer ; but others, and in fact, the 

 largest, have canals of only 0-03'" to 0*06'" in diameter, with walls of 

 0*004'" in thickness. In the areola and on the genitals the diameter 

 also varies in the larger glands, but within narrower limits. 



Between all the coils of the sudoriparous glands connective tissue 

 penetrates (occasionally with fat-cells), which conducts their 

 vessels, and connects the windings of their tubes ; in some cases 

 there is an outer fibrous envelope (ordinary connective tissue 

 with fusiform nuclei), surrounding the whole coil, which is par- 

 ticularly well-developed in those lying free in the subcutaneous 

 connective tissue (penis, axilla, etc.). 



§ 69. Secretion of the Sudoriparous Glands". — All the smaller 

 glands contain, as soon as a cavity becomes apparent within them 

 (which, however, is not always the case), only a clear, transparent 

 fluid, without any structural constituents; the contents of the 

 glands of the axilla, on the other hand, are rich in such con- 

 stituents. The secretion in the latter case appears, in the first 

 place, as a gray, transparent, slightly fluid, substance, with innu- 

 merable fine, pale granules, and often with scattered nuclei ; and, 

 secondly, as a whitish-yellow, tolerably tough mass, with a variable 

 number of large, dark, colourless or yellowish granules, nuclei, and 

 cells, similar to the epithelial cells already described. It is clear 

 that these contents, which, as I find, contain much fat and protein, 

 differ considerably from the ordinary sweat, which is fluid, and 

 contains no constituents of definite form, and, perhaps, are more 

 nearly related to the sebaceous matter of the skin ; and on this 

 account, we might be induced to exclude the glands of the axilla 

 from the class of the sudoriparous glands, and to regard their 

 secretion as peculiar. But these glands also occasionally contain 

 a secretion with but few granules, nay, even nothing but fluid; 

 moreover, there occur, amongst the larger glands of the axilla, 

 smaller ones, which, as regards their contents, come by gradual 

 stages to agree with the very large glands, on the one hand, and 



