THE SENSES OF PRESSURE OR TOUCH 



737 



points, but experimentation has shown that these points are not 

 evenly distributed throughout the skin, but are more numerous and 



FIG. 365. FIG. 366. 



FIG. 365. CORPUSCLES OF GRANDRY FHOM THE DUCK'S TONGUE. (Izquierdo.) 



A, compound of three cells, with two interposed discs, into which the axis-cylinder 

 of the nerve, n, is observed to pass; in B there is but one tactile disc enclosed between 

 two tactile cells. 



FIG. 366. GRAXDRY CORPUSCLE ix TRAXSVERSE SECTION. (After Dogiel.) 



more sensitive in some regions of the integument than in others. 



FIG. 367. SENSORY NERVE TERMINATING IN ARBORIZATIONS AROUND THE ENDS OF MUS- 

 CLE-FIBERS. (Ceccherelli.) 



Their total number has been estimated at 500,000, excluding the 

 region of the head. Upon the back of the leg, 1.0 sq. cm. of the skin 



47 



