148 'Journal of Comparative Neurology and Psychology. 



mine what he had recorded concerning the weight of the brain and 

 spinal cord. 



The weight of the brain and of the entire central nervous sys- 

 tem is given in all the tables. The weight of the spinal cord can 

 be obtained therefore by subtracting the former from the latter. 

 Having the weight of the brain and spinal cord, we can find the 

 ratio between them. 



There are moreover two tables, one for each species, in which 

 we have the body weights of males to compare with the weight 

 of the central nervous system. In the other six tables, the body 

 weights for the males (two tables) are given "after evisceration" 

 and for the females (four tables) without correction for ova. In 

 these cases the body weights can only be estimated. 



These data have been carefully worked over, with a view to 

 determining how they compare with my own. 



In the first instance, Fubini's observations on the brain weights 

 in unopened males of R. temporaria, are closely similar to mine. 

 He obtains, however, weights for the spinal cord nearly double 

 mine; thus his brain cord ratio is abnormally low. This is shown 

 in the following table. 



TABLE 20. 



Showing the ratios of brain weight to the cord weight as determined by FuBiNl, 



and by me. 



