Noguchi 



Plate 24 







_ Ifc 





A. Medulla oblongata of Rana catesbiana (4 hours in physiol. salt sol.). X 500. 



B. The same, kept 2 hours in Cobra venom solution. X 500. 



C. The same, kept 4 hours in Moccasin venom solution. X 500. 



(Photomicrographs.) 



