lyS LECTURE IV. 



in the liio-li road to the sanguiferous 

 system. 



No one is disposed to doubt the results 

 of these experiments, for every one is more 

 or less convinced, by his own feelings, that 

 affections of the mind, and bodily exertion, 

 will, by disturbing or otherwise occupying 

 the nervous energies, diminish or prevent 

 appetite and digestion. 



The pylorus, or opening by which the 

 stomach communicates with the intestinal 

 tube, is variously formed in different ani- 

 mals, allowing or preventing, in various de- 

 grees, the transit of alimentary matter. In 

 the human stomach it is a small circular 

 and muscular aperture, admitting of occa- 

 sional dilatation, so as sometimes to give 

 passage to a body of the diameter of half a 

 crown, yet ordinarily so contracted as to 

 detain even fluids in the cavity of the sto- 

 mach ; else how could we distend it 

 with liquors as we sometimes do. It may 

 be useful to mention a case which serves to 

 illustrate the degree in which such deten- 



