80 PROCEEDINGS OF THE ANATOMICAL AND ANTHROPOLOGICAL 



NOTES ON THE BEAIN OF AN IMBECILE. 

 By N. J. CALDER, M.A., Secretary. 



To the naked eye, this brain presents an appearance very similar 

 to that of an ordinary adult brain. It is small, but the convolutions 

 are well marked and the fissures are in their usual positions. The 

 parietal lobe perhaps shows slight divergence where the sulci are 

 extremely numerous, and -the convolutions very closely packed 

 together. The opercula are well developed. 



The weight of the brain is only 32 - 8 ounces. The individual 

 was about fifty years of age, and the brain of a person of this age 

 weighs usually about 49'5 ounces. The significance of the weight of 

 the brain depends upon the proportion it bears to the dimensions of 

 the body. In this relation, it is interesting to compare the weights of 

 the various organs of this individual with those of a boy, seven years 

 of age, who was about the same height. 



Imbecile. Healthy Boy. Average Adult. 



Height - - 39 inches 37 inches 



Brain - - 32~8 ounces 40'23 ounces 49-5 ounces. 



Heart - - - 4-5 2-7 11 



Liver - - 29'4 



Spleen - 7 



Kidneys - - 4-55 



Eight Lung - - 1O5 



Left Lung - - 9'8 



19-13 55 



1-85 7 



4-05 10 



22 



20 



From these figures it will be seen that he has a small brain 

 compared with his other organs. The weight of the brain of the boy 

 is larger, whereas the weights of the other organs are smaller. 



For this brain the Society is deeply indebted to W. Sim Garden, 

 M.B., Menston, Leeds, who presented it to the Anatomical Museum. 



