96 
On the Jtilood of 
numerable corpuscles, which are called blood globules. 
These globules consist, in the vertebrate classes, of an 
enclosing vesicle and an enclosed nucleus, with colouring 
matter. The blood globules in the invertebrate classes 
consist of a vesicle containing colouring matter onlv. 
The blood of all the Vertebrata is of a red colour, and 
is composed of two distinct constituents while circulating 
in the living body; namely, the liquor sanguinis, or fluid 
part, and the red part or hsematocine, which is consti¬ 
tuted by the blood globules. 
The blood, after having been removed from an animal 
resolves itself into two parts—serum, or water of the 
blood, as it is vulgarly called, and the clot, or solid matter. 
This clot results from the coagulation of one of the solid 
elements of the liquor sanguinis, which in coagulation 
entangles the globules. Hence the redness of the clot. 
After the separation of this solid component from the 
liquor sanguinis, it still retains another solid matter in 
solution, which may be coagulated by heat. This is the 
albuminous part; and the fluid left is of a saline character, 
containing various salts—of soda and potass, and iron. 
The red part of the blood is the constituent which we 
are now to investigate. 
The shape of the blood globules in the two great divi¬ 
sions of the vertebrate classes is remarkable, and has for 
some years, formed the physiological character of the 
animal in its zoological relations. 
The prevailing figure of the blood globules in those 
animals which suckle their young (hence termed 
Mammalia) is discoid. 
In the oviparous classes, the’globules are elliptical: 
they are generally discoid in the invertebrate classes, and 
sometimes angular. 
The two interesting animals Ornitliorhynchus, or platy¬ 
pus, and Echidna, or porcupine ant-eater, confined to 
