VI FORM AND FUNCTION 75 
disappearance. It is easy to connect the reptile’s low 
temperature with his poverty in corpuscles. 
The white blood corpuscle is an object of extreme 
interest. It is simply a cell of granular appearance 
with a nucleus. In shape it is roundish, but when 
alive it is a perfect Proteus. If a drop of blood be 
Fic, 22,—(a) and (4) White and red corpuscles of man from Quain after Schafer ; (c) 
and (d) red corpuscles of Humming Bird and Ostrich after Gulliver; (¢) Amceba 
after Moore. All to same scale. 
taken from the finger and put under the microscope 
the white corpuscles are easy to make out, scattered 
in comparatively small numbers among the red, but, 
unfortunately, they have ceased to move, the change 
of temperature, and conditions generally, having 
killed them. But there are one-celled creatures to 
be found in stagnant water which closely resemble 
