216 



PROCEEDINGS OF THE NA TIONAL MUSEUM. 



VOL. XXXII. 



Till' (jreatcd reiitral frontal hreiullli compared with ijrcatesi Jx-eadili of the nkiill. {reiluved), 



tite latter taken o.s 100. 



Adult white males 74. 3 



Adult white females 73. 5 



Adult Indians 75. 6 



Adult negroes 76. 9 



Human fetuses and young 81. 6 



Chimpanzees 75. 



Orangs 77. 8 



Gibbons 79. 2 



Monkeys 79.0 



Lemur 80. 5 



It appears tliat tlie difference between the greatest breadth of the 

 frontal lobes and the greatest breadth of the skull, or, respectively, of 

 the cerebrum, is less in the lemur and in most of the lower primates, 

 as well as in the luiman fetuses and 3 oung, than it is in human adults, 

 particularly among whites. With all their imperfections, these deter- 

 minations point to another line of anthropometric studies on the brain, 

 promising interesting results. 



The detail tables of measurement of the cranial fossas are appended 

 to facilitate Control of the preceding data, as well as the utilization of 

 the series for future studies; and to show the individual variations 

 which could not be dealt with conveniently in the text. 



DETAILED DATA. 



Summarij of absolute and relative lengths of the cranial fossse. 



