100 



200 



300 



350 400 



Chart 2 The growth curve of the callosal area according to age. Albino rat. 



TABLE 3 



Showing the calculated callosal area at different ages of the albino rat. Data on 



standard body iveight are taken from table 74, 'The Rat' {Donaldson, '15), 



and the calculated callosal area determined by formula 1 



46 



