2 Franklin P. Mall. 



sowohl das grosse wie das kleiue, ja auch das Riickenmark, den Typns 

 dcs kindlichen und weiblichen Hirns eines Europaers besitzt und 

 ausserdem sich dem Typus des Hirns der hoberen Aifen nahert," etc. 



It is admitted by Huschke tbat it is extremely difficult to recognize 

 a difference in tbe convolutions due to sex, but, "es ist aber keine 

 Frage, dass sie existiren." He further generalizes, as has often been 

 quoted, that in the male there is more frontal lobe : ''Das "Weib ist 

 ein homo parietalis und inter par ietalis, der Mann ein homo frontalis, 

 und das Weib hat deshalb auch ein runderes Gehirn, als der Mann." 

 According to his measurements it was found that in seven women 

 the frontal lobe, i. e. the portion of the brain covered by the frontal 

 bone, contains 23.9 per cent of the brain weight. In fifteen men it con- 

 tains 24.4 per cent. So it was actually determined by weighing the 

 parts of the brain that the frontal lobe in men is one per cent heavier 

 than in women. This difference he believes corresponds with the 

 differences of the areas of the surface of the brain as well as with 

 that of its volume. It may be noted that the individual frontal 

 lobes given in his tables range from 21.8 per cent to 26.1 per cent, 

 the values being often recorded to the second decimal place (e. g., 

 24.49 per cent). 



Meynert^ examined 157 brains from insane individuals by separat- 

 ing the mantle from the brain stem which included the basal ganglia 

 and some of the gray substance of the island. He then cut the mantle 

 through the central sulcus with a scissors which gave him the frontal 

 lobe composed of the brain tissue in front of the fissure of Rolando 

 minus the basal ganglia. This portion was then compared with the 

 rest of the brain mantle. He concludes that in men as contrasted 

 with women there is relatively more brain substance in front of the 

 central sulcus than behind it — a conclusion which, it seems to me, is 

 not justified by his own figures. They are as follows. (ISTote 

 especially the summary in the third table.) 



According to Donaldson,^ Broca divides the cerebrum into three 

 lobes, one of which is the frontal, limited behind by the central 



^Meynert. Das Gesaiiiiutgewicht und die Tlieilgewichte des Gehirns. etc., 

 Vierteljahrsschrift fur Psychiatrie, Bd. 1, 1867. 

 ^Donaldson, Growth of Brain, London, 1805. 



