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OF. THE 
HELD AT PHILADELPHIA, 
FOR PROMOTING USEFUL KNOWLEDGE. 
Vol. XIX, New Series. lo, pp. 415, with 25 P Les 
Lately Published. oh 
CONTENTS. 
Art. I.—A New Method of Determining the General Pertu a= 
tions of the Minor Planets. By WILLIAM MCKNIGHT 
RITTER, M.A. rac 
Certain Insects. By JOHN B. SMITH, Sc.D. x 
Art. IlIl.—Some Experiments with the Saliva of the Gila M 
(Heloderma suspectum). By JOHN VAN DENBUR 
PH.D. 
Stellar Systems. By T. J. J. SEE, A.M., Ph.D. oe 1 
Art. V.—On the Glossophagine. By HARRISON ALLEN, M. 
Art. Vl.—The Skull and Teeth of Ectophylla alba. By HARRI 
ALLEN, M.D. 
Art. VII.—The Osteology of Elotherium. By W. B. ScorT. 
Art. VIII—Notes on the Canide of the White River Oligoc 
By W. B. SCOTT. 
Art. IX.—Contributions to a Revision of the North Ameri 
Beavers, Otters and Fishers. By SAMUEL N. RHOA 
Vol. XX, New Series. Part I, gto, pp. 62, with 3 pla s. 3 
Fust Published. as 
Art. 1.—The History of the Pelycosauria, with a Description f 
the Genus Dimetrodon Cope. By G. BAUR an 
EB. \C CASE, 
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