304 JAMES EDWARD ACKERT 



The intermediate layer of polygonal cells is for the most part 

 absent, though in places (e.g., the face) it appears as a single 

 sheet of isolated, more or less flattened cells, whose nuclei are 

 somewhat reduced in size (fig. 1). Numerous pigment granules 

 are present in this layer (fig. 1, pg). 



The stratum corneum is thickest in the palmar and plantar 

 regions. It is made up of several layers of cornified epithelium, 

 the outer ones of which are usually in the form of loose scales. 

 The deeper layers are more compact, and appear to consist of 

 flat, enucleate cells. In certain regions of the body (lining of the 

 mouth, lumbar region) these layers resemble to some extent the 

 stratum lucidum of the human skin, but the presence of this 

 stratum can be made out definitely only in the palmar and plan- 

 tar regions (fig. 2, si). 



The surface of the epidermis is frequently interrupted by 

 hairs, and also by' the openings of ordinary sudoriparous and of 

 modified sweat glands as Diem ('07), Porta ('10) and others have 

 shown. The ordinary sweat glands and the modified sweat 

 glands may open into the hair follicle, or independently on the 

 surface. The distribution of skin glands over the body is very 

 variable. Though not numerous in the region of the rump, 

 sweat glands are, however, present. This is in accord with Diem's 

 results, but opposed to those of Hoffman ('98). The writer was 

 unable to find sweat glands in the sole of the foot, and agrees 

 with Toldt ('07) that these glands do not occur in the ball of the 

 thumb. Toldt found numerous glands in the 'Saugescheibe,' 

 and also large groups of glands in the region of the neck and of 

 the external genitalia. The upper lip is more abundantly sup- 

 plied with skin glands than any other part-of the body. 



As is frequently the case, the superficial layer of the corium, 

 the stratum papillare, is raised into ridges and papillae which 

 project into the epidermis. These are most marked in the upper 

 lip, where simple and compound papillae are present. The 

 interlacing strands of connective tissue and the reticulum of 

 elastic fibers which together form the ground work of the corium 

 are comparatively fine and closely packed, thus causing this 

 layer to be somewhat dense. Mallory's connective tissue stain 



