TRANSACTIONS 



OF THE 



American Philosophical Society, 



Held at Philadelphia, 

 For Promoting Useful Knowledge. 



Vol. XIX, New Series. {to, pp. 415, with 25 Plates. 



Lately Published. 

 contents. 

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

 tions of the Minor Planets. By William McKnight 

 Ritter, M.A. 



Art II.— 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 Gib Monster 



f 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 Ectophylia alba. By Harrison 

 Allen, M.D. 



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



Art. VIII. — Notes on che Canidae 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, Mew Series. Part /, {to, pp. 62 \ with 3 plates. 



yust Published. 



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

 the Genus Dimetrodon Cape. By G. B AU and 

 E. C. Case. 



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