Rac mE Pen ae S F SY 
ee EO ad 
pe eee ‘ 4 “ : es Ral ; % iin e 
TRANSACTIONS. 
OF THE 
American Philosophical Societ 
HELD AT PHILADELPHIA, 
FOR PROMOTING USEFUL Rees . 
Vol. XIX, New Series. to, pp. 415, ie 25 Pla 
Lately Published. 
CONTENTS. 
Art. I.—A New Method of Determining the General Perturb 
tions of the Minor Planets. By WILLIAM wee 
RITTER, M.A. 
‘ 
“ © 
Art Il. ae Essay on the Development of the Mouth partie 
Certain Insects. By JOHN B. SMITH,SC.D. 
Art. IIl—Some Experiments with the Saliva of the Gila Mon 
s one suspectum). By JOHN VAN DENBUR 
HD. “ et 
Art. 1V.—Results of Recent Researches on the Evolution of 
Stellar Systems. By T. J. J. SEE, A.M., Ph.D. (Berl 
Art. V.—On the Glossophagine. By HARRISON ALLEN, M.D 
Art. VI—The Skull and Teeth of SRL alba. By HARRI 
ALLEN, M.D. 
Art. VIIL—The Osteology of Elotherium. By W. B. SCOTRs 
Art. VIII.—Notes on the Canide of the White River Oligocen 
By W.°B, SGOTH; 
Art. 1X.—Contributions to a Revision of the North Americ 
Beavers, Otters and Fishers. By SAMUEL N. RHOAL 
Vol. XX, New Series. Part I, gto, pp. 62, with 3 plate 
Fust Published. 
Art. 1.—The History of the Pelycosauria, with a ‘Descriptiay r 
the Genus Dimetrodon Cope. By G. BAUR an 
Bi G.- CASE. ‘: 
SUBSCRIPTION—FIVE DOLLARS PER VOLUME. ' 
SEPARATE PARTS ARE NOT SOLD. 
Address THE LIBRARIAN OF THE 
AMERICAN PHILOSOPHICAL Society, 
No. 104 SOUTH FIFTH STREET, 
