INNERVATION OF INTEGUMENT OF CHIROPTERA 327 



are very similar in each kind of sole described, and that the size 

 of the so-called second kind comes within the possible range of 

 that of the first, leads the writer to think that perhaps the ap- 

 parently different kinds of soles found by him in the striated 

 muscles in the epidermis of the bat are in reality one and the same 

 type. In the one, the granules have stained, in the other they 

 have not. 



5. Nerve endings on modified sweat glands 



So far as the writer has been able to ascertain, the literature con- 

 tains no reference to the innervation of sweat glands in bats. As 

 was noted elsewhere (p. 305), the modified sweat glands (fig. 10) 

 have a coating of smooth muscle fibers which are arranged longitu- 

 dinally (fig. 10, mu) . In a weakly stained methylene blue prepara- 

 tion from the interfemoral membrane of Myotis lucifugus. such 

 sweat glands have been observed with numerous stripes running 

 at right angles to the smooth muscle fibers (fig. 10, fi). These 

 stripes, which occur at comparatively regular intervals, extend 

 hoop-like around the secretory portion of the gland external to 

 the muscle fibers. The structures in question are much smaller 

 than the muscle fibers, have a wavy course, and take the deep 

 blue stain characteristic of nerve fibrils. A number (two to five) 

 of delicate non-medullated nerve fibers (fig. 10, no) can be traced 

 to the sides of these glands, but whether they connect with these 

 circular stripes, the writer is at present unable to ascertain. 



That sweat glands are under the control of the sympathetic 

 nervous system is generally recognized. As is well known, pre- 

 ganglionic neurites leave the spinal cord through the ventral roots 

 of the spinal nerves, and, after a shorter or longer course, termi- 

 nate in some sympathetic ganglion in a very characteristic man- 

 ner. Here the preganglionic neurites branch repeatedly, dividing 

 into numerous small varicose nerve fibers, which interlace to form 

 intracapsular plexuses around the cell bodies of the sympathetic 

 neurones. It is likewise well known that in the sympathetic 

 ganglia of Mammalia such intracapsular pericellular plexuses may 

 be very simple, consisting of only a few varicose fibrils, as well as 



