212 THE JOURNAL OF PHARMACOLOGY. 



centimeters below it, and here the hair seems to be longitudinally striate, 

 due to the fiber cells. 



The wool hairs are 5 to 7 cm. long and very uniformly 20 to 40 !>■ thick, 

 very circular and at places entirely smooth without echinations at the 

 edge. By this means as well as the lack of a regular curling they can be 

 immediately distinguished from the Merino wool hairs which possess an 

 irregular thickness and decided echinations. The medulla is never pres- 

 ent. The epidermal scales are very thin and often scarcely visible. The 

 front edge of the scales is not thickened, is drawn forward, manifold and 

 finely toothed, and the scales are entirely or half cylindrical, and the ar- 

 rangement is imbricate. On the whole these wool hairs resemble Angora 

 (grannen) hairs microscopically ; this similarity is increased by their 

 straight fibers, of which some of them appear like sharp dark lines. 



The structure of the common Wallachian sheep's wool deviates much 

 (Fig. 5). It represents an entirely different form among the ordinary 

 domestic wools. The staple also consists of wool and grannen hairs. 

 The latter are about 15 cm. long, the former about half of this. Both 

 are very vitreous, glossy, slightly wavy, but not straight. At the tip 

 the grannen hairs have a very narrow medullary cylinder (tube) and 

 are about 76 p. thick. The scales are entirely lacking (have been rubbed 

 oflf). Several centimeters below the tip the scales appear and are at 

 first on one side. The medullary cylinder is almost continuous, and 

 relatively very narrow {\-\ of the hair's breadth). Towards the middle 

 the breadth of the fiber (hair) increases to about 100 !>■ ; for this reason 

 the fiber is very uniformly thick and the frequent thickenings and con- 

 strictions observed in the pure breed wools do not occur. Unlike the 

 Hungarian wool, this fiber is not entirely circular. The medulla is 

 not found at the base but i or 2 cm. above it and in the form of a narrow 

 line. The scales do not at all resemble those of the Hungarian domestic 

 wools (Fig. 5). Their width is greater than the height, are very thin 

 and are only visible on account of the slightly thickened edges ; they are 

 not concave and the edge is fraj^ed dentate (ausgefressen gezahnelt); their 

 arrangement is distinctly imbricate but the fiber is hardly indented, gen- 

 erally almost even. 



The wool hairs of the Wallachian domestic wools bear an indisputable 

 relationship to their grannen hairs. They are thinner (tip 22 ,"., middle 

 50//, base 38,«), more sinuous, short and circular (stielrund). The edge 

 of the pithless fiber is distinctly serrate. The scales are broader trans- 

 versely and distinctly thickened at the front edge. 



Hungariaii Zackel Wool. — The examined sample consists of grannen 

 wool hairs. The former are about 30 cm. long, vitreous, scarcely wavy 

 and almost straight. At the base they are 84 ,«. with a medullary channel 

 21 p. in thickness. The epiderm here has a paved appearance and consists 



