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oval; every class has its own peculiar corpuscle, so that if we 
could suppose a man sufficiently gifted, and familiar with the 
size and shape of all kinds of blood cells, one drop of blood 
under the microscope would enable him to define the class which 
yielded it: for example :— 
In Man the average diameter is 3200 of an inch. 
In Monkeys, from 3342 to 3713. 
In Carnivora, from 3395 to 5365. 
In Ruminants, from 3777 to 7045. 
In Marsupials, from 3405 to 4046. 
In Musk Deer it is so small as 12325. 
: 3123 to 3555 long diameter 
In Camel tribe 4 5876 to 6444 short diameter. 
1555 to 2358 long diameter. 
3166 to 5325 short diameter. 
1124 to 1324 long diameter. 
1800 to 2743 short diameter. 
1043 to 1108 long diameter. 
1821 to 2000 short diameter. 
§ 2000 to 2461 long diameter. 
2900 to 3555 short diameter. 
Possibly the circle and internal life of every being are 
greatly fixed by the shape, size, and quality of the blood 
globules ; just as the objective life of every animal is determined 
by the nature of its teeth and limb girdles; for if the size and 
shape of blood cells be of no consequence in the life and 
development of animals, why should the same kind of animal 
always have the same sort of blood? even in the Batrachians 
which begin life as fishes, the corpuscles do not change their 
shape, but only increase in size as the creature lays aside its 
_ lower kind of life. 
The theory of evolution would teach us that the “vis 
insita,” and altered external surroundings, can re-mould any 
form of life in time; but if this were true, it could have no 
effect on the shape and size of the red particles; blood is formed 
pari passu with the first development of the heart itself, and is 
it at all conceivable that any kind of external force could in 
the smallest degree alter or affect its nature ? 
In Birds 
In Reptiles ... 
In Amphibia 
In Fishes 
