202 LEEUWENHOEK AND HIS ‘‘ LITTLE ANIMALS” 
ordinary rules, the volume of the sphere ABGC is 1728 
times greater than the volume of D. Now suppose I see, 
among the rest, a second sort of little animals, which 
i 
(Text-Fie. 3.] 
I likewise measure by my eye (through a good glass, giving 
a sharp image); and I judge its axis to be the fifth part, 
though I shall here allow it to be but the fourth part (as 
Fig. E), of the axis of the first animalcule D; and so, 
