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SCIENTIFIC PAPERS. Selected by C. S. Sargent. 



I. Reviews of Works on Botany and Related Subjects, 



1S34-1887. 

 H. Essays, Biographical Sketches, 1841-1886. 

 2 vols. 8vO) each ^3.00. 



LETTERS OF ASA GRAY. Edited by Jane Loring 

 Gray. With Portraits and other Illustrations. 2 vols, 

 crown 8vo, $4.00. 



HOUGHTON, MIFFLIN AND COMPANY, 

 Boston and New^ York. 



