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 



b c 



Fig 22.— («) and (b) White and red corpuscles of man from Quain after Schafer : (c) 

 and (J) red corpuscles of Humming Bird and Ostrich after Gulliver; (*) Amoeba 

 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 



