136 ^Journal of Comparative Neurology and Psychology. 



Putting these data in the form of curves in Chart 4, we see 

 that the relative brain weights follow the order of the absolute 

 weights of the entire nervous system and of the brain, the highest 

 ratios being given by R. pipiens. 



Cord\vfei^hl 



10 



►R.e. 



►R.l. 



Body •vs^ei^lil'— 6tns. 



15 



20 



25 



30 



35 



-10 



^5 



CHART 4. 

 Showing the ratios of brain weight to spinal cord weight. 

 R. p. = Rana pipiens. 

 R. e. = Rana esculenta. 

 R. t. = Rana temporaria. 



TABLE 13. 



Showing the percentage of water in the brain and in the spinal cord. Averages 



from groups of three. 



R. pipiens. 



R. esculenta. 



R. temporaria 



Percentage of 

 Water in 



