In Preparation. 

 Parts 11. and III. of Drs. KORSCHELT and HEIDER'S 

 "TEXT-BOOK OF THE EMBRYOLOGY OF INVERTE- 

 BRATES," Translated and Edited by H. J. CAMPBELL, M.D., 

 Senior Demonstrator of Biology and Demonstrator of Physiology in 

 the Medical School of Guy's Hospital. 



Swan Sonnenschein & Co., Ld., London ; 

 Macmillan & Co., New York. 



