GREEN PIGMENT OF INTESTINAL WALL OF CH^TOFTEIJUS. 405 



BONELLIN. 



?n = 



Wave leni^tlis in ///: (1 = 0-001 ^). 



Intensity of the perpendicularly falling lij,'lit passin<^ through a plane- 

 parallel layer of n mm. thickness, in percentages of liie original 

 light intensity. 



