VU1 PREFACE 



Mabel Herford. To these and to many others who have offered sugges- 

 tions, the author makes grateful acknowledgment. Messrs. P. Blak- 

 iston's Son & Co. have supplied several figures from their anatomical 

 publications, and have endeavored to maintain the high standard of press 

 work which has characterized previous editions. 



FREDERIC T. LEWIS. 



CAMBRIDGE, MASSACHUSETTS, 

 September, 1913. 



