THE JOURNAL OF PHARMACOLOGY. 



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and there, short medullary cylinders possessing but ^-i the width of the 

 fiber and are sometimes absent at distances. At the middle of the fiber 

 an indistinct scaly tissue, scales arranged in plates, will sometimes ap- 

 pear. Frequently this arrangement will be quite distinct, but not as a 

 rule. Several centimeters above the base of the hair the cylinder becomes 

 continuous and finally occupies half of the breadth of the fiber. At first 

 it consists of one row of elongated medullary cells, later on two, less sel- 

 dom three rows of transverse elements which conduct air and have coarse 

 granular contents. There is often a distinct plate arrangement of the 

 epidermal scales present here. These are mostly thick-edged, but often 

 very indistinctlj'. 



Fig. 4. Hungarian domestic wool. A. Near the 

 point, epidermal scales, e, showing indistinctly at 

 the base. £. At the center of the hair. Central 

 cylinder,"/; concave epidermal scales. X 35o. 



Fig. 5. Grannen Hairs of 

 a Waliachian Sheep Wool. 

 Epidermal scales, c, thin and 

 narrowly peltate. Thin cen- 

 tral cylinder. X 35°- 



Longitudinally the Leicester fibers show great irregularities in their 

 thickness, but this irregularity occurs so uniformly that the fiber must be 

 considered homogeneous (Fig. 3). 



These statements refer to the medium class of Leicester wools. The 

 finer ones resemble the Merino wools very much, the main differences be- 

 ing their greater length, 15 to 20 cm., their very uniform and greater 

 thickness (at tip 34 ij-, at base 46 fj.) and coarse wooliness (quarta). The 

 fibers of an English Long-neat worsted (combed wool yarn) which was 



