PREFACE xi 



The present volume deals with animal organisation as re- 

 presented by the Frog, with the Protozoa, and the Coelenterata. 

 The second volume will deal with the Coelomate Metazoa. 

 I had hoped to bring out the two volumes simultaneously, but 

 have been called out on military duty since the outbreak of 

 the war in S. Africa, so the completion of the second volume 

 has been delayed. 



Gilbert C. Bourne. 



The Barracks, Tipperarv, 

 March I goo. 



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