V3 PREFACE 



Society {Biological Reviews) ; Cambridge University Press (The 

 Determination of Sex, T) oncastev, Plant Biology, Godwin, Ciliary 

 Movement, Gray, Zoology, Shipley and MacBride, Primitive 

 Animals, Smith, Palceontology , Wood) ; Herrn Gustav Fischer, 

 Jena (Ergehnisse u. Forts chritte der Zoologie, Lehrhuch der 

 Protozoenkunde) ; Herren Walter de Gruyter & Co. {Handhuch 

 der Zoologie) ; the Council of the Linnean Society of London 

 (Zoological Journal) ; Messrs Macmillan & Co., Ltd. (Cambridge 

 Natural History, Harmer and Shipley, Human Protozoology, 

 Hegner and Taliaferro, Textbook of Comparative Anatomy, Lang, 

 Textbook of Zoology, Parker and Has well) ; Messrs Methuen & 

 Co., Ltd. (Textbook of Entomology , Imms); Oxford University 

 Press (The Animal and its Environment and Manual of Zoology, 

 Borradaile). Acknowledgment to the authors of the works from 

 which these illustrations are taken is made in the legends. 



THE AUTHORS 



CAMBRIDGE 



February, 1932 



