262 



PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. 



MS J SJS 30 S4S b-IS 



Fig. 114. Curve of intensity of sleep according to Monninghoff and Piesbergen. The 

 figures along the abscissa represent time in hours from the beginning of sleep; those along 

 the prdinate the relative intensity of sleep measured in milligram-millimeters, expressing 

 (he intensity of sound of a falling body necessary to awaken the sleeper. 



Fig. 115. Curve of intensity of sleep in a child of three years and eight months, as deter* 



mined by Czerny. 



