A 



MANUAL OF ZOOLOG-Y 



BT 



RICHARD HERTWIG 



Professor of Zoology in Vie University at Munich 



FROM THE FIFTH QEEMAN EDITION 



TRANSLATED AND EDITED BY 



J. S. KINGSLEY 



Professor of Z ooUiy u in Tufts College 



^U UN\^^^ 



NEW YORK 

 HENEY HOLT AND COMPANY 



1902 



