PLATE XXII 
Ss 
pr 
yp 
ANNAN ass A 
A FIGURE FROM LETTER 32 (14 JUNE 1680) 
illustrating the experiment with the pepper- 
tube. On the left, Leeuwenhoek’s original 
drawing (reduced to #): on the right, the same 
figure as improved by the engraver for re- 
production in the printed letter (same size). 
facing p. 197 
