26 PROPERTIES OF 



three or four times I have thrown it into oil, and then frozen 

 it; but after all these trials, the result was the same (xv). 

 The blood was always evidently fluid on being thawed, and as 

 evidently jellied when exposed to the air. 



Besides being coagulated when exposed to the air, the co- 

 agulable lymph, as well as the serum, is known to be fixed by 

 heat ; but the degree of heat has not, so far as I know, been 

 determined. It has been supposed to require a degree almost 

 equal to that which cpagulates the serum ; x but one much less 

 is necessary, as will appear from the following experiments. 



EXPERIMENT VII. 



Having found, from a number of trials, that blood, kept 

 fluid by means of true Glauber's salt, had its lymph coagulated 

 by a heat of 125 of Fahrenheit's thermometer, I supposed 

 that the degree necessary for fixing it in its natural state could 

 not be very different from this. I therefore prepared a lamp 

 furnace with a small vessel of water upon it ; this water was 

 heated to 125; and then laying bare the jugular vein of a 

 living dog, I tied it properly, cut a piece of it out, and put it 

 into this water : after eleven minutes, I took out the vein, opened 

 it, and found the blood entirely coagulated : thence I concluded, 

 that 125, or less, was sufficient to coagulate the blood of a 

 dog. It may be necessary to observe here, that the part coagu- 

 lated was only the lymph ; for the serum requires a much greater 

 heat to fix it, that is, a heat of 160, as will appear hereafter. 



EXPERIMENT VIII. 



The same experiment was repeated in such a manner, that 

 the heat never went higher than 120i ; and I found that, on 

 opening the vein at the end of eleven minutes, the lymph 

 was entirely coagulated, even in this heat. 



EXPERIMENT IX. 



I repeated the experiment with a heat no higher than 114, 

 and at the end of eleven minutes, the vein being opened, the 



1 See Traite du Cceur, t. ii, p. 93 ; Schwenke Hsematolog. p. 138. 



(xv.) See Note xi, where the effects of cold and of freezing on coagu- 

 lation are detailed. 



