undergoes in the act of coagulation. 183 
the appearance. This happens sometimes several days after 
the formation of the net-work has taken place. When clear 
serum without any globules is put upon the glass, nothing is 
extricated, but when the serum is quite dry, it cracks, and the 
cracks may be mistaken for the net-work ; but by comparing 
them with it, the difference is found to be obvious. 
These facts which Mr. Bauer has enabled me to bring 
forward, appear to point out an important change the blood 
undergoes, after it is extravasated. When this happens in 
living animal bodies, from whatever cause, and in whatever 
circumstances it takes place, no difficulty remains in account- 
ing for its afterwards becoming vascular, since all that is 
necessary for that purpose is the red blood being received 
into the channels of which this net-work is formed. 
I shall not detain the Society with any farther observations 
in support of what I have advanced, satisfied that if the facts 
do not bear themselves out, it will be superfluous to load them 
with theoretical opinions. 
I cannot conclude this Lecture, without paying a tribute to 
the President of the Society ; not a tribute of praise, but a tri- 
bute of justice; for whenever general science, or any of its 
branches, are brought under his consideration, the zeal and 
exertion, which he shows upon all occasions, to promote the 
pursuits of individuals, exceeds whatever has been done by 
others, in this or any other country, and is above all praise. 
Whatever Mr. Bauer has already done, and whatever he 
may hereafter bring to light, respecting the more minute 
parts of animal bodies, is entirety to be attributed to the Pre- 
sident ; for it is at his particular request, under his encou- 
ragement, and in compliance with his wishes, that Mr„ 
