Mortoit's Crania Americana. 351 



the third, the brain weighed 2 lbs. 5 oz. ; the cerebelkim, 5 oz. ; 

 together, 2 lbs. 10 oz. 



In the appendix to Dr. Monro's work on the brain, Sir William 

 Hamilton states the average weight of the adult male Scotch 

 brain and cerebellum to be 3 lbs. 8 oz. troy. 



Again, a difference in mental power between men and women 

 is also generally admitted to exist, and there is a corresponding 

 difference in the size of their brains. 



Sir William Hamilton states the average weight of the adult 

 female Scotch brain and cerebellum, to be 3 lbs. 4 oz. troy ; 

 being 4 oz. less than that of the male. He found one male brain 

 in seven to weigh above 4 lbs. ; and only one female brain in a 

 hundred exceeded this weight. 



In an essay " on the brain of the negro, compared with that of 

 the European and the ourang outang, published in the Philosophi- 

 cal Transactions for 1836, part H, Professor Tiedemann, of Hei- 

 delberg, adopts the same principle. After mentioning the weights 

 of fifty-two European brains, examined by himself, he states that 

 " the weight of the brain in an adult male European, varies be- 

 tween 3 lbs. 2 oz. and 4 lbs. 6 oz. troy. The brain of men 

 who have distinguished themselves by their great talents, is often 

 very large. The brain of the celebrated Cuvier weighed 4 lbs. 

 11 oz. 4 dr. 30 gr. troy, and that of the distinguished surgeon Du- 

 puytren weighed 4 lbs. 10 oz. troy. The brain of men endowed 

 with but feeble intellectual powers is, on the contrary, often very 

 small, particularly in congenital idiotismus. The female brain is 

 lighter than that of the male. It varies between 2 lbs. 8oz. and 

 3 lbs. II oz. I never found a female brain that weighed 4 lbs. 

 The female brain weighs on an average from four to eight oun- 

 ces less than that of the male ; and this difference is already per- 

 ceptible in a new-born child." 



We have adduced these proofs and authorities in support of the 

 proposition that size influences power, because we conceive it to 

 be a principle of fundamental importance in every investigation 

 into the natural history of man, founded on the physiology of the 

 brain ; and also because in the hasty zeal of many of the oppo- 

 nents of phrenology, to undermine the discoveries of Dr. Gall, it 

 has been denied with a boldness and pertinacity more allied to 

 the spirit of contentious disputation, than to that of philosophical 

 enquiry. Its importance in a dissertation on national crania is 



