MODIFYING CIRCUMSTANCES. 1005 



power of vision corresponds with the enormous 

 size of the optic nerves and tubercles. The sense 

 of smelling is likewise more acute in the common 

 hound in which the olfactory nerves are spread 

 over an extensive surface, than in other dogs ; 

 while in the grey-hound, whose nose is small, the 

 sense of smell is very imperfect. The mouth and 

 nose are larger in the African, the North Ameri- 

 can Indian, and some other savages, than among 

 civilized nations, who are inferior to them in the 

 faculties of taste and smell. Dr. Caldwell says, 

 that the sensuality of men is indicated by the size 

 of the mouth, lips, nose, and reproductive organs. 



But why is it that many individuals with mode- 

 rately sized heads, possess far greater poiver and 

 activity of mind than others who have large and 

 well formed heads? Until this problem is solved, 

 human physiology, and especially that important 

 branch of it termed phrenology, cannot be re- 

 garded as a complete science, even were it 

 established that all the different organs of the 

 brain, and their specific functions, had been fully 

 discovered, which cannot yet be fairly assumed. 

 In reply to the above, I have already shewn it to 

 be a law of nature, that the power of any organ is 

 in proportion to the amount of rich arterial blood 

 with which it is supplied, the quantity of caloric 

 that passes through it in a given time, ceteris pari- 

 bus, and depends on the amount of respiration. 



For example, the cohesive and contractile 



