10 



Weight of the Central Nervous System of the Frog 



This increases from 9 per cent, to 10 per cent, between the time of emergence and the 

 first ten days of June, when it reaches a maximum. In undergoing this change the 

 frog passes the midsummer weight about May 15. From this maximum the weight 



table IV 



Containing twenty-eight records from leopard frogs (based on Table VII, Donaldson and Schoemaker, 

 1900). This table shows in successive columns the original tabular number, the sex, body-weight, 

 length, and the observed and calculated weights of the central nervous system in milligrams. 

 The last two columns show the percentage deviation of the calculated from the observed weights 

 of the central nervous system; the percentages being computed on the observed values as the 

 standard. 



Difference, milligram; percentage, 0.0, 

 24 



