THEORY OF COAGULATION. 651 



In another set of experiments, I found that 

 when half an ounce of blood from the divided 

 vessels of the neck in a healthy sheep was put in 

 a small tin cup, and surrounded with a freezing 

 mixture of snow and common salt at 17, it began 

 to coagulate slightly in two minutes and a half, 

 increasing slowly till the end of five minutes, 

 when the clot was very loose and imperfect; soon 

 after which it began to congeal, and was quite 

 frozen in fifteen minutes. In another experi- 

 ment, the same quantity of blood was taken from 

 the carotid artery of a vigorous sheep, (whose 

 temperature was 106 in the left ventricle of the 

 heart, and 104 in the right side,) and placed in a 

 tin cup, surrounded with a freezing mixture at 

 0, when it began to solidify just perceptibly in 

 three minutes, and was quite frozen in six mi- 

 nutes. After remaining in this state above an 

 hour, it was gradually thawed by exposure to the 

 atmosphere, which was at 51, and formed a loose 

 coagulum. In a third experiment, three half 

 pint cups were filled with blood from the neck of 

 another sheep, one of which was placed in water 

 at 130, another in water at 100, and the other 

 exposed to the air at 51; when they all began 

 to coagulate in about one minute and a half, but 

 that in the cup at 130 contracted more firmly in 

 two minutes, than either of the others in five 

 minutes. 



Corresponding with the fact established by 



