i g6 Sir Everard Home’s additions to 
Plate X. 
Represents the same appearance magnified 200 diameters 
or 40,000 superficies, and shows that the globules of the 
blood take no part in forming it* 
Plate XI. 
Represents a portion of coagulated blood injected under 
the receiver of the air pump, with the common minute 
injection, coloured by vermilion, by exhausting the eoa- 
gulum of its carbonic acid gas, and the injection taking its 
place. 
This plate contains two figures ; Fig. 1 shows the course 
of the injection immediately under the pellicle which forms 
upon the surface of the coagulum : this is every where hori- 
zontal ; for as the carbonic acid gas had no means of escape 
upwards, it was forced to move in an horizontal direction. 
Fig. 2 shows the injected part of the coagulum exposed 
in a section, rather oblique than vertical, in consequence of 
the coagulum being too soft to admit of the section being 
more direct. The drawing was made before a pellicle had 
formed upon the cut surface, which, had it taken place, would 
have rendered the surface opaque. The course of the injec- 
tion is seen through the semi-transparent coagulum for some 
way into its substance. The round points are sections of 
portions of injection which had followed a horizontal course. 
The parts are magnified 12 diameters, or 144 superficies. 
