196 Journal of Comparative Neurology. 



yond this period, the lateness of the season makes it unwise to 

 attempt an interpretation of this table. 



Cause of the Increase in Weight. 



Thus far it has not been shown that the increase in the 

 weight of the absorbing cord is due to water, although this 

 cause has been the one tacitly assumed. For the determination 

 of this point the cords of those frogs used in the 6, 12 and 18 

 hour groups of Series VII, were utilized. In the case of each 

 of these groups the cords were dried at 8 5°C after weighing, 

 and the amount of residue (dry substance), was determined. 



In the three tables which follow (tables VIII, IX and X), 

 there are given first the average body weights for both the 

 "control" and "absorbing" frog, the percentage gain in 

 weight for the standard millimeter of the absorbing frog — first 

 as directly observed, second as calculated on the basis of the 

 dried substance — and for both control and absorbing cords, the 

 percentages of water and the absolute weights of the dry 

 residues. 



Table viil 



Control Frog. Absorbing Frog. 



