THE JOURNAL OF PHARMACOLOGY. 



211 



The straight grannen hairs at the base are 80, a (medulla, 34/^), towards 

 the middle at thickest portion, 90// (medulla, 35 //) and at the tip 70// 

 (medulla 30 p) thick. The medulla forms an almost even continuous cyl- 

 inder ; constrictions of the same where it is single-rowed are seldom. In 

 those instances the cells are elongated. At the normally thick places the 

 medullary elements are more round, but never transverse. The entire 

 fiber, as well as the most straight hairs of natural breeds, shows a uniform 

 thickness and an almost circular cross section (in this respect it differs 

 from fibers obtained from a stock that has been hybrid). 



The epidermal scales are two to three times longer than broad. The 

 breadth is 16 to 20 /x, so twelve to fourteen scales may surround the fiber. 



FiG. 6. Grauiien Hairs of Fig. 7. Graiinen hairs of 



Banater Wool. X 350. a German Domestic Wool. 



Shovvinsi thin (d) and [D) 

 thick places. Stiiatious (f) 

 and epidermal scales {e). 

 X350. 



The scales are narrowly peltate, pointed on the two upper sides and 

 rounded semi- circularly. The edge is much thickened and very refractive. 

 The scales besides this are concave, not distinctly imbricate, but are ar- 

 ranged more like plates. For this reason the fibers appear to be straight 

 or slightly sinuously toothed, never serrate. lyike most coarse straight 

 grannen hairs, the Hungarian domestic wool does not contain much oil 

 and is therefore easily injured at the tips by friction. 



For that reason the epiderm is frequently lacking at the tip and several 



