ASA GRAY. 335 



ia botany. The two volumes of the original Torrey and Gray " Flora " 

 will always remain a memorial of the unbroken friendship of America's 

 two greatest botanists, alike in the spirit which animated their work 

 and in the reverent simplicity of their characters. 



The greater part of Gray's scientific work during the thirty-five years 

 following the completion of the second volume of Torrey and Gray's 

 " Flora," in 1843, had a more or less direct bearing on the contemplated 

 revision and enlargement of that work. Besides the papers printed in 

 the Academy's publications, he wrote a very large number of mono- 

 graphs and notes on points connected with the determination and de- 

 scription of new and doubtful species. They are scattered through the 

 proceedings of different learned societies, and the columns of the 

 American Journal of Science, the Torrey Bulletin, Botanical Gazette, 

 the Naturalist, and other American, as well as European journals. One 

 of his most important works was " Genera Florae Americae Boreali- 

 Orientalis Illustrata" (1848-49), in which he intended to figure and 

 describe all the genera of the Eastern States, with the aid of the artist, 

 Mr. Isaac Sprague. Of this work only two of the proposed volumes 

 were ever published, owing to the expense entailed. Other important 

 papers were " Plantae Wrightianae Texano-Neo-Mexicanaa," in the 

 Smithsonian Contributions of 1852 and 1853; "Plantar Lindheimeri- 

 anae," written in connection with Dr. Engelmann ; " Reports on the 

 Botany of the 32d, 38th, 39th, and 41st Parallel Expeditions," in con- 

 nection with Dr. Torrey ; Gamopetalce in Watson's Flora of California, 

 etc. An examination of the complete list of his works, which will 

 soon be printed in the American Journal of Science, would alone con- 

 vey any adequate idea of his extraordinary fertility as a writer, and the 

 wide range of his investigations. 



After this long preparation of thirty-five years, the first part of the 

 " Synoptical Flora," including the Gamopetalce after Compositce, ap- 

 peared, in 1878. It formed the first part of the second volume ; for, on 

 the revised plan, the first volume was to include the Polypetalce and 

 Gamopetalce through Compositce, and the second volume the remaining 

 Exogens and the Endogens. A second part, including from Caprifoli- 

 acece through Compositce, appeared in 1884, and in 1886 supplements to 

 both parts were issued, and the whole bound in one volume. He was at 

 work on the Polypetalce, and had nearly finished the Vitacece, when 

 attacked by his last illness, and the unfinished volumes must now be 

 completed by him who was his associate for many years, and, after 

 Dr. Gray himself, the best fitted for the work. 



Gray's critical knowledge of the Flora of North America not only 



