Frog 

 {on the flat) (side view) Bird Fish Mammal Camel lilood of mammal 







White 



Frog's Corpuscle Mammalian Mammalian 



after addition of water after addition of syrup after addition of salt 



1. Eed blood-corpuscles. 



Necturus. Nucleus 

 swollen ; nuclear and 

 corpuscular envelopes 

 ruptured. 



O.L\ 





2. The colourless corpuscles of human blood, x 1000. a, eosinophile cells ; 

 6, finely granular oxyphile cells ; c, hyaline cells ; d, lymphocyte ; 

 e, polymorphonuclear neutrophile cells (Kanthack and Hardy). The 

 magnification is much greater than in 1. 



3. Cover-glass preparation of spinal cord of ox, x 250. 



(Stained with methyle.ne blue). 

 Dendritic processes 



Bipolar nvrve-cell 



If 



^BSIs- * * 



4. Potassium in a, frog's^erythrocyte (black) ; 

 6, nerve (black) ; c, striped muscle (black) ; 

 d, cartilage cells (yellow) (Macallum). 



Frontispiece 



