PLATE XXXI 
aa 
VASANSS 
Gilg 
ar 
g 
Mj 
4 
q 
z | 
weeny 
1 i) 
-/ GE GRAUARAAUUAAVERSUTLSGBSVaay) 
LEEUWENHOEK’S © MICROSCOPE ”’ 
For explanation see the text. 
facing p. 328 
