C 368 ] 
Received May 17, 1770. 
XXXII. Experiments on the Blood , with 
J'ome Remarks on its Morbid Appearances \ 
by William Hewfon, F. R. S . 
Read June 14 & 21. S the following Experiments 
y \ are made on a fubjedt generally 
thought important, and as the inferences which I have 
ventured to draw from them feem to explain fome 
appearances in difeafes, they will not, I flatter my 
felf, be thought altogether unworthy the attention 
of this learned Society. 
When frefh blood is received into a bafon, and 
fuffered to reft, in a few minutes it jellies, or coa- 
gulates, and foon after feparates into two parts, dif- 
tinguifhed by the names of crafj'amentum and ferum. 
Thefe two parts differ in their proportions in dif- 
ferent conftitutions : in a ftrong perfon, the craf- 
J 'amentum is in greater proportion to the ferum than 
in a weak one ; and the fame difference is found to 
take place in difeafes ; thence is deduced the gene- 
ral conclufion, that the lefs the quantity of ferum 
is in proportion to the cra(famentum , bleeding, diluting 
liquors, and a low diet, are the more neceffary : 
vvhilft in fome dropfies and other difeafes where the 
