Some pinions of tbe 



" Dr. Mark has done good service to the student in translating 

 this valuable treatise into English. . . . The reader will find in these 

 pjges a fairly full and satisfactory account of all that has been 

 done in this department of science. The work may be taken 

 throughout as an authoritative exposition of the present state of 

 our knowledge of embryology." Lancet. 



" There was a decided want for a text-book of this nature. . . . 

 \Ve must express our high approval of the admirable summary 

 which is given at the close of each chapter. A word of praUe 

 must also be given to the illustrations, which are clearly printed, 

 the two coloured plates being also well executed. This work 

 should find a prominent place among the text-books which are 

 essential for the student of zoology. It gives exactly what is 

 needed for instruction in the principles of development and in the 

 details of that process as represented in the highest group of living 

 forms." Glasgmv Htrald. 



"The book provides exactly what is wanted. The typography 

 and illustrations are excellent." Hospital. 



