4 
Sir Everard Home on the conversion of Pus 
saw some hundreds of globules rise from the bottom, and 
ascend in a straight line in the centre of the tube, and when 
arrived within about half an inch of the upper end, they 
spread in all directions, and descended close to the sides 
of the tube; when near the bottom they re-ascended, but 
more rapidly than the first time, and when held longer in 
the warm hand, the rapidity of the motion was much in- 
creased. In two days more, I found upon examination the 
number of globules much greater ; and on the 25th of Sep- 
tember, 1818, the number of the globules was such as to 
form a sediment at the bottom of the tube of half an inch in 
thickness, besides a strong coat on the inside of the tube." 
This experiment of Mr. Bauer’s on the serum, was re- 
peated by Mr. Faraday, at the Royal Institution, on human 
blood, in a tube of larger dimensions, and the serum sus- 
pended on mercury : the result was exactly the same, the 
number of globules was increased in ten days in the same 
proportion as in Mr. Bauer’s experiment, and when the 
lower end of the tube was held in a warm hand, the same 
motion of the globules took place. 
These experiments in proof of colourless globules forming 
in the serum, make this resemblance between blood and pus 
greater than has been generally believed. 
At the conclusion of my former Lecture, I mentioned that 
pus, in its inspissation, has carbonic acid gas evolved, in the 
same manner as in the coagulation of the blood, and that 
I was therefore led to the opinion, that this process was the 
first step towards the formation of granulations ; but my ex- 
periments having been made upon pus removed from the 
