Vibrations of Trevelyan’s bars by the Galvanic Current. 105 
recipient of the most interesting trees and shrubs of our country, 
together with many curious exotics, and also a numerous collec- 
tion of herbaceous plants.” In 1785, his account of our forest 
trees and shrubs, a 12mo volume of about 200 pages, was pub- 
lished. He attained the age of 79 years, but with a partial loss 
of sight during his later years; and died on the 5th of No- 
vember, 1801. He was born in the Society of Friends, and lived 
and died an exemplary member of that fraternity. 
It was only while engaged in collecting and editing the bio- 
graphical materials of this interesting volume, that Dr. Darling- 
ton ascertained that our two botanical patriarchs were not only 
men of kindred minds and pursuits, “ but that they were actually 
cousins-german, the sons of two sisters. James Hunt of King- 
sessing, in the county of Philadelphia, had the happiness to call 
those ladies his daughters, and the rare privilege of enumerating 
two of the earliest and most distinguished botanists of Pennsyl- 
vania among his grandchildren.” His cousin Bartram probably 
awakened his enthusiasm for horticulture and botany, and pro- 
moted his efforts. Fitly are their names and memorials here as- 
sociated, and heartily do we acknowledge our obligations to Dr. 
Darlington for the unwearied editorial labors which have given 
us the interesting volume that we have now so inadequately no- 
ticed,—a_volume which every where abounds with curious and 
important facts for the naturalist and the historian, and which Tes- 
cues from oblivion so many memorable particulars of the lives 
and times of our earliest devotees to science. 
Besides the notes scattered through the work, the editor has 
given, in a preface, a brief, but very accurate survey of the pro- 
gress of botany in North America,—of which science he is him- 
self one of the most sedulous and successful votaries. A. Gr. 
Art. XV.—Vibrations of Trevelyan’s bars by the Galvanic 
Current ; by Prof. Cuas. G. Pace, Washington, D. C. 
