AND ANIMAL LIFE. 299 



with respiration, but must be regarded as affect- 

 ing the heart by the disorders which have been 

 gradually induced in the distribution of the vital 

 fluid, by the depressing mental anxiety insepa- 

 rable from disease, and also by the congestion of 

 blood, which always, more or less, accompanies 

 internal chronic affections of a severe kind. 



CCCXXVII. The third class, in which we 

 have tumours, and many anomalous diseases that 

 seem to act directly upon the larger vessels of circu- 

 lation, will not require a minute consideration. 

 It is so obvious, if any part of the circulatory 

 system, indispensable for life, be disordered in its 

 function by tumours diminishing the capacity of 

 important vessels, that the contractions of the 

 heart will be irregular, or predisposed to this con- 

 dition, as these depend on the quantity, quality, 

 and motion of the fluid transmitted, that I shall 

 not attempt to enforce the argument by a super- 

 fluous examination of the subject. 



