BLOOD. 381 



Water, . .794 



Albumen, . 64 



Acid soap, 



Cholesterin (1-08) 



Olein, . )> 117 



Margarin, 



Stearin, 



Salts, &c. . 25 



Hematosin, trace. 



1000 



The analysis of Dr Christison of Edinburgh agrees with that of 

 Lecanu. 



14. Injection of salts into the blood of living animals. Mr 

 Blake has made a set of curious experiments on the action of salts 

 when thus injected.* He finds that salts with the same base have 

 generally the same action. The salts of magnesia when intro- 

 duced in any quantity arrest altogether the action of the heart, 

 and produce a complete prostration of muscular power. The 

 salts of zinc are similar, but not so powerful. The salts of ba- 

 rytes, strontian, and lead, occasion contractions in the muscular 

 tissues, which continue many minutes after death. The salts of 

 silver and soda produce a remarkable action on the pulmonary 

 tissue, which seems to occasion the death of the animal. 



The preceding account applies almost exclusively to human 

 blood. Few experiments have been made on the blood of 

 the inferior animals. There cannot, however, be a doubt that 

 the blood of every species of animal has something peculiar, and 

 adapted for the animal in whose blood-vessels it flows. This 

 is evident from the facts observed when blood is transfused 

 from one animal to another. It is well known that when a 

 blood-vessel in a living animal is opened, and the blood allow- 

 lowed to flow out, the animal loses all sense and motion, and 

 speedily dies. But if the blood of another animal of the same 

 species be made to flow into the vessels of the exhausted animal, 

 it speedily recovers its sensibility and power of motion, and sus- 

 tains no perceptible injury. The blood of a sheep in this way 

 may be transfused without injury into another sheep. But if we 

 transfuse the blood of a sheep into a cat or a dog, the animal dies. 

 This must be owing either to a diversity of the proportion of the 



Phil. Mag. (3d series), xviii. 547. 



