SCIENTIFIC PAPERS. Selected by C. S. SARGENT. 



I. Reviews of Works on Botany and Related Subjects, 



1834-1887. 



II. Essays, Biographical Sketches, 1841-1886. 



2 vols. 8yo, each $3.00. 



LETTERS OF ASA GRAY. Edited by JANE LORING 

 GRAY. With Portraits and other Illustrations. 2 vois. 

 crown 8vo, $4.00. 



HOUGHTON, MIFFLIN AND COMPANY, 

 BOSTON AND NEW YORK. 



