PROCEEDINGS 



OF THE 



American Philosophical Sdci^ity 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 

 Vol. LVI. 1917. No. 5. 



CONTENTS 



PAGE 



Mediaeval Sermon-bqoks and Stories and Their Study Since 1883. By 

 T. F. Crane 369 



Nebulai. By V. M. Slipher, Ph.D 403 



The Trial of Animals and Insects. By Hampton L. Carson . . . 410 



The Sex Ratio in the Domestic Fowl. By Raymond Pearl . . . 416 



PHILADELPHIA 

 THE AMERICAN PHILOSOPHICAL SOCIETY 

 104 South Fifth Street 

 '1917 



