200 Sir Everard Home on a new fact respecting 
“ mical characters of horn. The lower coloured portion was 
“ looser in texture and considerably softer. In dilute acetic 
“ acid it soon became perfectly gelatinous, and was dissolved 
“ in it by the aid of a gentle heat. It contained a much 
“ larger relative proportion of water than the upper portion, 
u and shrunk much more when dried, in which state, however, 
“ it resembled dried albumen. It appears that independent 
“ of colouring matter, these two portions of coagulum differ 
“ chiefly from each other in their state of concentration, the 
“ upper part containing more albumen, and less water, than 
** the lower/' 
EXPLANATION OF PLATE VI. 
Fig. l. The coagulum represented entire. While immersed 
in the serum the surface was flat, but after remaining a few 
hours in weak spirit to prevent it from falling to pieces, the 
surface put on its present appearance. 
Fig. 2. A perpendicular section of the same coagulum. 
Both of these figures are of the natural size. 
Fig. 3. A small part of the upper portion of fig. i. mag- 
nified 200 diameters, to show the size of the globules of 
which it was composed to be from ij - so to 0 ■ parts of an 
inch in diameter. 
Fig. 4. A small part of the lower portion, fig. 2. magnified 
200 diameters ; showing the size of the globules it contained 
to be from z - ;5 - 0 - 0 to t^to parts of an inch in diameter, mixed 
with a coloured gelatinous substance. 
Fig. 5. A coagulum of blood taken from the arm of a 
person labouring under symptoms of inflammation of the 
