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3 
of his health, he visited little and indulged in practically no botan- 
ical study. In 1866 he visited the botanists and botanical collec- 
tions at Florence, at Geneva, at Paris, and in London at the 
British Museum and the gardens at Kew. At the latter place he 
spent two weeks in the careful study of ferns, working assiduously 
among the collections, every courtesy and every assistance being 
rendered him by Sir Joseph Hooker, then Director of the Royal 
Gardens. 
He took many collecting trips, especially into New Jersey, 
with Gray, Canby and others, to the White Mountains of New 
Hampshire, and a portion of the last summer of his life was spent 
at Shelburne, N. H., with Professors Farlow and Penhallow in col- 
lecting the Sphagna of that region. During the summer of 1869 
he spent a month botanizing among the mountains of Utah, as the 
guest of Clarence King, who was in charge of the geological sur- 
veys of the fortieth parallel. 
Even in his undergraduate life his preference for the cryptoga- 
mous plants was marked, and he will be remembered chiefly for 
the work he did among them. His knowledge of the phaenoga- 
mous species, nevertheless, was very extensive and exact. He 
preferred, however, to entrust the work of publishing upon these 
plants to Professor Gray. His attainments in this line are shown, 
however, in the masterly way in which he has treated the Com- 
positae of King’s Expedition, and the additional material and other 
aid afforded by him in the preparation of the whole of the botany 
of that expedition is gracefully and effectively set forth in Wat- 
son’s general introduction. Besides this work his published ob- 
' servations on the flowering plants are few, although he retained 
much interest in them even until the last. 
His chief work from the beginning (1856) until about 1883 
lay among the ferns and their immediate allies. His first several 
papers were devoted to enumerations of various collections of 
ferns and descriptions of new species. He contributed the ac- 
counts of the Vascular Cryptogams to Torrey’s Botany of the 
United States and Mexican Boundary Survey, to Chapman’s Flora 
of the Southern United States, to Gray’s Manual of Botany of 
the Northern United States (both to the 5th and the 6th editions), 
to Gray’s Field, Forest and Garden Botany, to the Botany of 
