1901] Day, — Herbaria of New England 243 
mens at several hundred thousand. Professor William Gilson Farlow 
has the care of this herbarium. 
Harvard University, Gray Herbarium, CAMBRIDGE Mass- 
ACHUSETTS.— Early in his botanical work, about 1835, Dr. Gray 
began his herbarium and its development remained through the rest 
of his life one of his chief aims. His own collecting was largely done 
in the lake-region of western central New York, the southern Alle- 
ghanies, the central Rocky Mountains, Mexico, and California. 
While the plants thus secured are numerous, they form but a very 
small part of his herbarium. Associated with Dr. John Torrey from 
1838 to 1843 in the preparation of the Flora of North America, Dr. 
Gray received duplicatetypes of nearly all the plants therein described. 
Soon after began the notable series of trans-continental surveys 
which opened up the vast region of the Great West. During this 
epoch extending from Frémont's Expedition in 1842 to the Natural 
History Survey of California (the botanical results of which were 
published in 1876-1880) Dr, Gray's eminence in American botany 
attracted to him an extraordinary wealth of botanical material 
from all regions which were being explored. The collections of the 
Pacific Exploring Expedition, of Charles Wright in Texas, New 
Mexico, Arizona, Cuba, and Nicaragua, of August Fendler in 
New Mexico, Venezuela, and Trinidad, of Dr. George Thurber on 
the Mexican boundary, of Messrs. Brewer, Bolander, and others in 
California, of Dr. Sereno Watson in the Great Basin, and of Dr. 
Rotbrock in Arizona, merit particular mention on account of their 
size and importance. Dr. Gray also stood, almost from the beginning 
of his botanical work, in intimate exchange relations with the leading 
botanists of Europe, especially England, and derived from this source 
many extensive additions to his herbarium. 
In 1864 Dr. Gray presented his herbarium and valuable library to 
Harvard College and it was then installed in the building which it 
now occupies and which had been constructed for it through the 
liberality of Nathaniel Thayer, Esq. At that time Dr. Gray esti- 
mated that it contained 200000 specimens, including both phaeno- 
gams and cryptogams. From the early seventies until the end of 
his life Dr. Gray was engaged in the preparation of the Synoptical 
Flora, and oue source of the great value of the Gray Herbarium 
arises from the fact that so many of its specimens were critically 
examined and labeled during the progress of this work. Next in 
