258 



PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. 



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 ordinate the relative intensity of sleep measured in milligram-millimeters, expressiui; 

 the 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. 



