STUDY OF IJKAINS OF SIX E.MINKNT SCIENTISTS AND SCHOLARS. 267 



this his steadily increasing ill health also contributed. .He finally died of an attack 

 of pneumonia at thirty-six. He was unmarried. 



His intellectual make-up is well illustrated in his paper on the convolutions of the 

 primates. It is replete with observations which form the basis of a brilliant generali- 

 zation, and it concludes with a novel and remarkable application of mathematical 

 principles in explanation of the arrangement of the convolutions. His intellectual 

 development was unquestionably precocious ; at twenty he had the balance, force and 

 judgment of much oider men.* 



The brain was found to have remained in Midler's fluid ever since 1892. As a 

 natural result the brain-substance had become exceedingly fragile and had suffered 

 badly from subsequent handling. It had been broken into numerous fragments when 

 received by me and it was only with the utmost care that I was successful in deline- 

 ating the greater part of the mesal aspect of the cerebral halves. Fortunately a cast 

 of the undissected bi"ain had been made under Dr. Dercum's supervision and with the 

 help of this cast and such of the fragments as were still useful, the author was able to 

 reconstruct much of the cerebral contour. The objective study as hereinafter reported 

 is therefore based upon combined observations upon the cast and the brain fragments 

 and is necessarily incomplete in some respects. By means of more extensive dissec- 

 tion than would have been warranted in a lietter preserved brain it was possible to 

 completely expose the insulte and make casts of them. This was done with great 

 care and the result was excellent. 



Unfortunately the weight of this brain is not on record. Judging from the 

 dimensions of the cast of the brain, it must have weighed about 1500 grams, or some- 

 where within the range of 1475 to 1525 grams. 



The Cerebrum. 

 This specimen is one of the most richly fissured brains in the series. The frontal 

 and parieto-occipital areas are particular!}' rich in secondary fissures and ramifications 

 and one is reminded of the brachycephalic type of cerebrum. The left hemicerebrum 

 is the most notable in every respect. 



Left Hemicerebrum. 



The Interlobar Fissures. Tke Sijlvian Fissure and Us Rarai. — The sylvian fissure 



is 6 cm. in length and curves gently dorsad to terminate as the episylvian ramus, o 



cm. in length, there l:)eing no hyposylvian ramus. The sylvian angle is 20°. The 



dei)ths of the sylvian fissure are as follows : Pre-sylvian depth, 13 mm. ; medi-.sylvian, 



*Tlie writer is iudebted to Dr F. X. Dercuin for this biographical sketcli of A. .1. Parker. 



