44 SHINICHI MATSUMOTO 



may not be possible in the case of the tissues of the frog Uving 

 in vitro. Not only in their movements, but also in the phago- 

 cytic phenomena (with respect to foreign bodies) do they show a 

 certain degree of resemblance. 



The question of the said phenomena in the warm-blooded ani- 

 mals, as well as their bearing upon bacteriology and serology, 

 will be considered later. 



I wish to thank Prof. R. G. Harrison for the direction and 

 support which he has given to this work. 



C. SUMMARY 



The epithelium of the cornea of the frog which was vitally 

 stained with neutral red and Nile blue exhibits characteristic 

 granules in the cytoplasm. 



If properly stained, the granules exist through the entire 

 period of cell activity, without practically affecting the cells, 

 and facilitate the observance of cell movements. 



Phagocytic phenomena of the corneal epithelium with refer- 

 ence to melanin, carmin, etc., are definitely demonstrated. 



The distribution and arrangement of melanin and carmin gran- 

 ules, if finely powdered, show a certain degree of resemblance to 

 that of neutral red and Nile blue. 



