500 NAOKI SUGITA 



3. Length EF (abbreviation L.F.), passing through the frontal 

 pole at E and running parallel to the mesial surface of the hemi- 

 sphere (fig. 1). 



4. Length EG (abbreviation L. G), passing from the frontal 

 pole at E to the occipital pole at G (fig-. 1). This measurement 

 gives the greatest length. 



5. Height HK (abbreviation Ht.), from the stalk of the hypo- 

 physis to the dorsal surface and vertical to the plane on which 

 the brain is resting (fig. 2) . 



These lines here marked on the surface of a cerebrum really 

 indicate the shortest distance between the terminal points, a dis- 

 tance which has been exactly measured with sliding calipers to 

 a twentieth of millimeter. 



As a matter of fact, the point G is difficult to fix, while the 

 other points are relatively easily found and fixed. I took as G 

 the extreme point of lateral contact of the cerebrum and the 

 cerebellum (disregarding the paraflocculi). Sometimes this line 

 of contact was disturbed in the removal of the brain, but in such 

 instances I replaced the parts and measured the greatest dis- 

 tance from the frontal tip to a point at the occipital pole which 

 was supposed to be G. 



To measure the height, I brought the brain to the edge of the 

 glass plate, inserted one end of the calipers under the basal surface 

 at the stalk of the hypophysis and, holding the calipers vertically 

 to the plate, carefully measured the distance to the dorsal surface 

 of the brain. 



In a fresh brain it is of course hard to get exact measurements 

 owing to the softness of the brain substance, but each measure- 

 ment was repeated more than three times for each diameter and 

 the average value was recorded. 



These measurements were intended first, to show the rate of 

 increase in each dimension of the cerebrum during growth and 

 second, to furnish a basis with which to compare the corresponding 

 measurements after fixation for histological study and at various 

 later stages. All these data are necessary in order to determine 

 the coefficients needed to convert the observed values of the 



