■32 Franklin P. Mall. 



regarding male and female types are of no scientific value. It may- 

 turn out, however, that variations in the gyri and sulci will not be of 

 the same percentage in both men and v^omen and that the constant 

 value in the latter will be found more readily, as is the case with 

 other anatomical variations (Schwalbe). 



In this study of several anatomical characters said to vary according 

 to race and sex, the evidence advanced has been tested and found want- 

 ing. It is found, however, that portions of the brain vary greatly 

 in different brains and that a very large number of records must be 

 obtained before the norm will be found. For the present the crude- 

 ness of our method will not permit us to determine anatomical 

 characters due to race, sex or genius and which if they exist are com- 

 pletely masked by the large number of marked individual variations. 

 The study has been still further complicated by the personal equation 

 of the investigator. .Vrg-uments for difference due to race, sex and 

 genius will hencefor^vard need to be based upon new data, really 

 scientifically treated and not on the older statements. 



ISTOTE TO THE PRECEDING TaBLE. 



The data given in the preceding table have been aranged in a 

 great variety of ways, but only three of these bear upon the subject 

 under discussion. They are given in Figs. 1 to 3. The individiual 

 records are appended to enable those who are interested in the subject 

 to make further comparisons with those given by Bean and by 

 Spitzka, as well as for further use to those who may collect new data. 



The genu and splenium were outlined by Bean's method, given 

 on page 8. 



FOOTNOTE TO THE TABLE. 



'Pia on left side. =Pia off on left side. ^Boy. ^Brealv not even on left side. 

 Tia off on left side. ^Ventricle on right side greatly dilated. 'Break unsatis- 

 factory. ^Sulci on botb sides very irregular. ^Pia off on right side. "The pos- 

 terior left is decidedly larger than the posterior right. "Left operculum is 

 very large and right parietal convolutions are very atrophic. "Curious inter- 

 lacing of fiber bundles below central fissure on the left side. "Boy. "Central 

 fissure seems to be double on both sides. '^Break unsatisfactory. ^^Large 

 cavity in right brain ; break also unsatisfactory ; break on left side is not 

 accurate. "Breaks unsatisfactory. ^'Insane murderer. 



