THE DISEASES OF CATTLE. 49 



quire into the distinction prescribed by M. de Blainville, the 

 order I propose to observe is this : — 



" In the first paragraph I shall exhibit the parts of the body 

 in which gases are found, and this paragraph I shall divide ac- 

 cording as they are met with ; viz. : — 



" (A.) In the Blood. 



« (B.) In the Cellular Tissue. 



" (C.) In the Serous Membranes. 



" (D.) In the Mucous Membranes. 



" (E.) In the Skin. 



" In a second paragraph I shall treat of the physical and 

 chemical characters of the gas. 



" In a third of the physiological conditions of the produc- 

 tion of gases, either as elements of the body or as products. 

 1st. of respiration; 2d, of nutrition ; 3d, of digestion ; 4:th, of 

 absorption ; 5th, and lastly, of the secretions. 



" In a fourth paragraph, of the gases belonging to the dis- 

 eased state ; of the morbid conditions under the influence of 

 which gases are generated, and of the nature of disorders 

 which they beget. 



" In a fifth and last paragraph, I shall offer some general 

 considerations on the therapeutics of flatulent disorders. 



I. Of the Parts of the Body where Gases are found, 



" The existence of gas has been demonstrated in the blood, 

 in the cellular tissue, in the serous cavities, upon the surfaces 

 of the mucous membranes, and upon that of the skin. 



" (A.) Of Gases contained in Vessels, mixed or circulating 

 with the Blood. 



. " Venous blood admits gases, as may be plainly proved, and 

 in health too, and we know that they become accidentally in- 

 troduced into it. 



" Commencing with animals occupying a low station in the 

 scale of animal existence, the tench, for example, we ascertain 

 by opening the body of the animal under water, that there ex- 

 5 



