vi PREFACE TO THE FIRST EDmON 



encc might here he made (o lliose in tl:e Anatomies of Lane; and AMedcr- 

 sheini, the J';mbr3-ologies of Balfour, Korschelt and lleidcr, Miiiol, and 

 Hertwig, and Wilson's work on The Cell. 



The editor must here return his thanks to Dr. George A\'. 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. KiNGSLEY. 



Tufts College, Mass., S-'pl. lo, 1002 



