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On the effect of heated iron upon fluid blood out of the body . 
That I might ascertain the effect of heated iron immedi- 
ately after it was applied to fluid blood, I bored a hole in the 
centre of the bottom of a horn cup, through which the same 
acu punctorium used in the case of aneurism was passed up 
into the middle of the vessel ; and when it was heated by 
the same bar of iron and spirit lamp, three ounces of blood 
were received from the arm into the cup, and the heat con- 
tinued for half an hour, after which the blood was left at 
rest for 24 hours. 
The coagulum had no buff on the surface. When a per- 
pendicular section was made of it, the mass of the red 
coagulum was interspersed with minute white particles of 
coagulable lymph, and that part in contact with the needle, 
for the space of half an inch round, was in the same state as 
is represented in the drawing of the aneurismal coagulum. 
To carry on this investigation with pieces of iron, the 
heat of which was ascertained, I made the following expe- 
riment : three pieces of iron, weighing an ounce each, with 
iron handles covered with wood, were placed in separate 
cups, and blood from the arm immediately received into 
them to the amount of three ounces. In the first, the iron 
was red hot, in the second, the red colour had just gone off, 
and the third was taken out of boiling water. In five minutes 
the heat of each portion of blood was ascertained by the 
thermometer, the pieces of iron being removed. No. 1. was 
lio°, No. 2. 105°, No. 3. 85°, the atmosphere 55 0 . After 
standing 24 hours, perpendicular sections were made of them. 
