( 114) 



FROG-BLOOD. 



If, on one hand, we compare the protoplasmic network in tlie horse 

 and rabbit with that of the frog on tlie other, we are struck by 

 the fact, that in the frog the volume of network is so considerable. 



On further consideration, however, this point agrees with what 

 we observed in 1886. It then appeared, that while we may dilute 

 horse-blood serum with from 60 to IO^/q of water before colouring- 

 matter issues, frog-blood serum will bear 20üo/o and more of water. 

 This would not be possible, if there was as much inti'acellular fluid in 

 these blood corpuscles as in those of the horse's, for the expansion 

 would have then become much too strong. 



ISpermatozou of the Frog. 

 In conclusion I will describe a few experiments, which served 



