262 



PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. 



ZJ5 JJO MS 3 3.5 3.30 J.f 4 -U'S 430 



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

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

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

 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. 



