TRANSACTIONS 
OF THE 
American Philosophical Society, 
“HELD AT PHILADELPHIA, 
FOR PROMOTING USEFUL KNOWLEDGE. 
Vol. XIX, New Series. gto, 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. 11] —Some Experiments with the Saliva of the Gila_Monster 
(Heloderma suspectum). By JOHN VAN DENBURGH, 
PH D. 
Art. 1V.—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 Glossophagine. By HARRISON ALLEN, M.D. 
Art. VI.—The Skull and Teeth of Ectophylla alba. By HARRISON 
ALLEN, M.D. 
‘Art. Vil.—The Osteology of Elotherium. By W. B. SCOTT. 
Art. VIII].—Notes on the Canide of the White River Oligacenes 
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 I, gto, pp. 62, with 3 plates. 
Fust Published. 
Art. |.—The History of the Pelycosauria, with a Description of 
the Genus Dimetrodon Cope. By G. BAUR and 
Ba OASE, 
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. 
“ 
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