PROCEEDINGS 



OF THE 



WASHINGTON ACADEMY OF SCIENCES 



VOL. XII, No. 1, PP. 1-25. PL. I, TEXT FIGS. 1-7. FEBRUARY 15, 1910 



ON THE MANNER OF LOCOMOTION OF THE 



DINOSAURS, ESPECIALLY DIPLODOCUS, 



WITH REMARKS ON THE ORIGIN 



OF THE BIRDS 



BY 

 OLIVER P. HAY 



PUBLISHED QUARTERLY BY THE 

 WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



WILLIAMS & WILK1NS COMPANY 



2427-2429 YORK ROAD 



BALTIMORE, MD. 



Entered at Baltimore P. O. as second class mail matter. 



