May, 1915. 



KNOWLEDGE. 



147 



ti 



Figure 125. 

 Skin extracts from rabbits (see page 146). 



n i » * i r 



FlGUKl 126. 



Radula . > t Zonites nli vet arum of Moqmti I indon, stained; in Canada b 



X about 140 >. i page I 



