LIQUID FARTS OF ANIMALS. 



blood have been made. But the results obtained are so incon- 

 sistent with each other that no satisfactory conclusions can be 

 deduced from them. The following may be considered as the 

 differences between arterial and venous blood, which seem to be 

 pretty satisfactorily determined. 



1. The colour of arterial blood is scarlet, that of venous brown- 

 ish red and much darker. 



2. Arterial blood coagulates more rapidly than venous blood. 



3. The crassamentum from arterial blood is more bulky and 

 firmer than that from venous blood. 



4. Arterial blood contains less water than venous blood. 



5. Arterial blood contains more globules and more fibrin 

 than venous blood. 



6. The albumen, fatty matters, and salts, are the same in both. 



7. Probably arterial blood contains most oxygen gas, and ve- 

 nous blood most carbonic acid gas. 



8. According to the analysis of MM. Macaireand Marcet 

 Junior, arterial blood contains more oxygen than venous blood, 

 while venous blood contains more carbon than arterial blood. 

 The result of their analyses was as follows :* 



Arterial. Venous. 



Carbon, ...>.:. 50-2 ,_/._. 5 ^'7 



Hydrogen, 6-6 $>*$ 6-4 



Azote, .' 16-2 . 16-2 



Oxygen, . 36-3 . 217 



99-3 100-0 



9. The specific gravity of arterial blood is rather higher than 

 that of venous blood. 



Would it be safe to infer from these facts, that the part of the 

 blood chiefly employed in nourishing the living body is the glo- 

 bules, and that the diminution of these globules during the cir- 

 culation is made up again while the blood is passing through 

 the lungs ? The chyle contains globules ; but they are white, and 

 it appears from the analyses of Macaire and Marcet that the 

 quantity of azote is much greater in blood than in chyle. 



Dr Denis made a comparative analysis of the blood drawn 

 from a vein and from the capillary vessels by means of cupping- 

 glasses. But no appreciable difference could be discovered. 



* Mem. de la Societe Phys. et d'Hist. Nat de Genev- v. 22a 



