38 



NOBUHARU SUITSU 



MEASUREMENT AND ENUMERATION 



Great care was taken to select the section nearest the median 

 plane. The selected sections from the several brains were pro- 

 jected on a sheet of paper with a Leitz-Edinger projection 



TABLE 1 



Showing the age, sex, body length, body and brain weights, and area of callosum of 



the seventy-six normal albino rats used in this study, entered by 



litters according to increasing age 



apparatus, at a magnification of exactly twenty diameters, and 

 the outline accurately traced. At the transition of the splenium 

 corporis callosi to the psalterium, the boundary line was drawn 

 along the largest fibers of the fornix longus. The area of the 

 callosum in the drawing was then measured three times to a 



