" The science of animal embryology advances so rapidly that English 

 students have anxiously waited this long-promised translation of the 

 leading German manual. Delay has not, however, had the result of 

 rendering the book out of: date. On the contrary, it is a considerable 

 improvement on the German edition, owing to the insertion of numerous 

 notes by the original authors as well as by the two competent translators." 



Natural Scii «c< . 



" Drs. Korschelt and Heider are both well-known authorities, and their 

 volume shows a wide knowledge and considerable care in the selection 

 and criticism of a wide literature. Since Balfour wrote his classical 

 treatise an enormous quantity of additional information has been gained, 

 and the best of this is incorporated in the present volume." 



The Hospital. 



" This admirable translation into English of Drs. Korschelt and 

 Heider's text-book supplies what in England has been a long-felt want. 

 The translators, moreover, have had the valuable assistance of the authors 

 in supplying numerous additions to the original text, in the form of 

 brief notices of results that have been published since the original first 

 appeared, and the work will be received with gratitude by all zoologists, 

 whether lecturers or students." — Guardian. 



" The publication of this work by the Professors of Zoology in the 

 Universities of Marburg and Berlin will be hailed with satisfaction in 

 the English-speaking scientific world, who have not sufficient facility in 

 the German tongue to refer to the original, and by those whose time is 

 too limited to enable them to keep before them the rapidly accumulating 

 papers and monographs upon embryological subjects." 



Educational Review. 



" This admirable zoological text-book. The book is a standard German 

 text-book of its subject, not only thoroughly equipped within its own 

 compass, but also provided with a comprehensive bibliography of the 

 further literature of the subject. No pains have been spared over the 

 English rendering. It deserves a hearty welcome from English students 

 of zoology." — Scotsman. 



" It is a prominent feature of the work before us that its teachings 

 tend profoundly to show how deep is the hold which evolution, as an 

 explanation of the problems of development, has attained on the minds 

 of biologists. It has proved itself to be a veritable beacon-light, guiding 

 to a knowledge of hitherto dark places in the domain of life." 



Glasgow Herald. 



