TRANSACTIONS 



OF THE 



American Philosophical Society, 



Held at Philadelphia, 

 For Promoting Useful Knowledge. 



Vol. XIX, Neiv Series. 

 Part /, /fto, pp. ig8, with j Plates. Lately Published. 



CONTl^NTS. 



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. 2y2, with ij Plates. Just Published. 



CONTENTS. 



Art. 111. — 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 Glossophagin^. By Harrison Allen, M.D. 



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

 RISON Allen, M.D. 



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Volumes I-XVIII, can be obtained. 



Price, Ninety Dollars. 



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