206 The Descent of Man. Part I. 



But it is important to remark that, whether Gratioiet was right or 

 wrong in his hypotnesis respecting the relative order of appearance of 

 the temporal and frontal sulci, the fact remains ; that, before either 

 temporal or frontal sulci, appear, the foetal brain of man presents 

 characters which are found only in the lowest group of the Primates 

 (leaving out the Lemurs) ; and that this is exactly what we should 

 expect to be the case, if man has resulted from the gradual modifica- 

 tion of the same form as that from which the other Primates have 

 sprung. 



