TRANSACTIONS 



OF THE 



American Philosophical Society, 



Held at Philadelphia, 

 For Promoting Useful Knowledge. 



Vol. XIX, New Series, ^to, pp. 41^, with 2^ Plates. 

 Lately Published. 



CONTEJNTS. 



Art. I. — A New Method of Determining the General Perturba- 

 tions of the Minor Planets. By William McKnight 

 RiTTER, M.A. 



Art 11.— An Essay on the Development of the Mouth Parts of 



Certain Insects. By John B. Smith, Sc.D. . 

 Art. III. — Some Experiments with the Saliva of the Gila Monster 



(Heloderma suspectum). By John Van Denburgh, 



PhD. 

 Art. IV. — Results of Recent Researches on the Evolution of the 



Stellar Systems. By T. J. J. See, A.M., Ph.D. (Berlin). 

 Art. v.— On the Glossophaginae. By HARRISON Allen, M.D. 

 Art. VI.— The Skull and Teeth of Ectophylla alba. By HARRISON 



Allen, M. D. 

 Art. VII.— The Osteology of Elotherium. By W. B. SCOTT. 

 Art. VIII. — Notes on the Canidas of the White River Oligocene. 



By W. B. Scott. 

 Art. IX.— Contributions to a Revision of the North American 



Beavers, Otters and Fishers. By Samuel N. Rhoads. 



Vol. XX, New Series. Part /, ^to, pp. 62, with j plates. 



Just Published. 

 Art. I. — The History of the Pelycosauria, with a Description of 



the Genus Dimetrodon Cope. By G. Baur and 



E. C. Case. 



SUBSCRIPTION— FIVE DOLLARS PER VOLUME. 



SEPARATE PARTS ARE NOT SOLD. 



Address THE LIBRARIAN OF THE 



-<. American Philosophical Society, 

 No. 104 South Fifth Street, 



Philadelphia, U. S A. 



