“TRANSACTIONS ~ 
OF THE 
American Philosophical ss 
HELD AT PHILADELPHIA, BIRSS 
FOR PROMOTING Pee KNOWLEDGE. hee 
Vol. XX, New Series. gto, pp. 397) with 9 Plak 
Fust Published. . 
CONTENTS. > 
Art.  I.—The History of the Pelycosauria, with a Des 1 
tion of the Genus Dimetrodon Cope. of 
Baur and E. C, Cass. <S. 
Art. II.—The Chronological Distribution Se the Bia 
branchs. By O. P. Hay. . 
Art, III.—Results of Observation with the Zenith 
of the Sayre Observatory from January 
to August 19, 1895. By CHARLES ES 
Art. IV.—A Study of the Chromosomes of the Gen 
of Metazoa. By Reece: H. oe 
Ph.D. Nae nis ies 
Montana. . By faxes Doucrass. 
Art VI. — Results of Observation with the aeaite T 
of the Sayre Observatory from “April: I, 
December 27, 1893. HG CuaRtes poet 
eros 
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