vi PREFACE TO THE FIRST EDITION 



ence might here be made to those in the Anatomies of Lang and Wieder- 

 sheim, the Embryologies of Balfour, Korschelt and Heider, Minot, and 

 Hertwig, and Wilson's work on The Cell. 



The editor must here return his thanks to Dr. George W. Field for 

 his kindness in allowing the use of his translation of the first part of the 

 book as the basis of the present edition. 



J. S. KlNGSLEY. 

 TUFTS COLLEGE, MASS., Sept. 19, 1902 



