434 THE LAWS OF ORGANIC 



from such an imperfect knowledge of some of 

 the most important laws of the human constitu- 

 tion, it is impossible to extend the limits or im- 

 prove the principles of our profession. 



DXXXII. The reasoning which I have hitherto 

 brought forward in support of the views as ex- 

 planatory of the various states of the pulse, of 

 the origin and influence of sensations, and of 

 many important symptoms connected with thesys- 

 tem during the continuance of nausea, is entirely 

 founded on sanguineous sympathy. By a similar 

 kind of investigation, and by the application of 

 the same reasoning, we shall understand every 

 other change in the circulation of the blood, and 

 in the generation of animal heat, consequent on 

 the action of vomiting. 



I have already stated, that the blood from the 

 head, and from other parts of the body, is retarded 

 in its flow towards the chest when the stomach is 

 engaged in the ejection of its contents ; and, still 

 further, that, as soon as the operation ceases, the 

 blood rushes in greater quantity to the thoracic ca- 

 vity, producing a condition of the lungs almost 

 approaching to congestion ; but if the vomiting be 

 excessive , and frequently repeated, we have differ- 

 ent results. The muscular exertion which the frame 

 undergoes, in a succession of expiratory actions, 

 has the tendency to equalize the distribution, and 

 increase the stimulating qualities of the blood. 

 The blood is more generally diffused throughout 



