The Development of the Frog's Egg 



AN INTRODUCTION TO EXPERIMENTAL EMBRYOLOGY 

 By THOMAS HUNT MORGAN, Ph.D. 



Professor of Biology in Bryn Mawr College. Author of " Evolution and 

 Adaptation," " Regeneration," etc. 



Cloth 8vo $1.60 net 



"Professor Morgan's bo k gives us a much-needed text-hook for 

 both student and instructor, and it should stimulate and greatly aid 

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 embryulogical research." — American Journal of Science. 



" A clear, succinct, and comprehensible account of all the known 

 phases of the fertilization and development of the frog's egg. . . . 

 That the statements are clear and intelligible as possible the reader 

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 eral student or the reader who is interested in the matter of the physi- 

 cal basis of heredity will find here the fundamental facts regarding the 

 first beginnings of life and the structure of the egg as well as the sperm 

 cell." — The Independent. 



A Text=book of Entomology 



Including the Anatomy, Physiology. Embryology, and Metamorphoses of In- 

 sects, for Agricultural and Technical Schools and Colleges as well as for 

 Working Entomologists. 



By ALPHEUS S. PACKARD, M.D., Ph.D. 



Professor of Zoology and Geology, Brown University 



Cloth 8vo $4.50 net 



" I have greatly admired your recent text-book of Entomology. 

 There is only one word to express my admiration of it, — Splendid." — 

 Professor S. W. WlLLlSTON, University of Kansas. 



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