Chap. 1 6.] Horns ^ Hoofs, and Claws. 205 



winding cylinders there appeared minute globules of 

 the fame diameter with the cylinders. Having crufhed 

 the hair at one of its- extremities, it appeared as if 

 formed of many irregular polifhed trunks, which were 

 compofed of bundles of very fmall winding cylin- 

 ders, with fome globules fcattefed on the cylinders 

 themfelves. 



The nails are horny infenfible bodies, formed of thin- 

 lamellae or plates. They rife by a fquare origin/rom 

 the laft joints of the fingers and toes, and are hard 

 where they are expofed to the air, but foft near their 

 roots. The ftructure of the horns, hoofs, and claws 

 of animals is very fimilar to that of our nails. A mi- 

 nute portion of a finger nail being fubmitted to the 

 microfcope, exhibited the fame appearance as the epi- 

 dermis. Both the nails and hair grow entirely from be- 

 low, by a regular propulfion from their roots. 



