176 LECTURE IV. 



gives us confidence in other opinions whicli 

 are thus deduced. I shall briefly relate 

 the experiments to which I have just al- 

 luded. 



Doctor Haighton, after having fed a 

 hungry dog whose stomach was empty, 

 with flesh meat, divides the eighth pair of 

 nerves which go from the brain, to be 

 distributed to the stomach, and thus pre- 

 vents or disturbs those vital actions, which 

 are necessary to the preparation of the gas- 

 tric fluid. Consequently, when after many 

 hours, he kills the dog, he finds the food 

 in the stomach perfectly undigested, and 

 but little changed. He performs a similar 

 experiment, but only divides one of the 

 nerves of the eighth pair, and the dog be- 

 comes dyspeptic, having eructations and 

 manifest uneasiness about the stomach ; 

 which symptoms continue for several weeks : 

 and though the dog eats the food which is 

 given to him, he becomes much emaciated, 

 yet gradually recovers, as the divided nerve 

 re-unites and resumes its functions. In like 

 manner, Mr. Brodie having observed, that 



