TRANSACTIONS 



OF THE 



American Philosophical Society, 



Held at Philadelphia, 

 For Promoting Useful Knowledge. 



Vol. XIX, New Series. 

 Part /, ^to, pp. iq8, with j 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. 



Part II, ^^tOy pp. 2'/ 2, with ij Plates. Lately Published. 



Art. (II.— Some Experiments with the Saliva of the Gila Monster 

 (Heloderma suspectum). By John Van Denburgh, 

 Ph.D. 



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 Glossophaginas. By HARRISON Allen, M.D. 



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

 RISON Allen, M.D. 



Part HI ^to, pp. i6S, with g Plates. Just Published. 

 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. 



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SLPARATE PARTS ARE NOT SOLD. 



Address THE LIBRARIAN OF THE 



American Philosophical Society, 



No. 104 South Fifth Street, 



Philadelphia, U. S A. 



