Travels in North America. O17 
will increase the condensation and dissipation of the fluid 
at the other end. 
These facts explain the properties of Mr. Bennet’s elec- 
trometer in a very clear and satisfactory manner. 
When the glass of that instrument is about four or five 
inches in diameter, and the gold-leaves cut so short as not 
to touch its interior surface, \t will appear evident, to those 
who are at all acquainted with electrical experiments, that 
the cap and gold-Jeaves form an insulated conductor, simi- 
Jar to the conductor described in the preceding experiment, 
and the gold-leaves will exhibit the same phanomena as 
the pith-balls suspended from the conductor at the end B. 
For a more particular account of Mr. Bennet’s Electro- 
meter, see Phil. Mag. vol. xl. page 415. 
The following experiment shows in a very clear and de- 
cided manner, that when an excited surface is brought near 
one end of an insulated conductor, electricity of the same 
kind as that of the excited surface is repelled from the 
other end. 
Two insulated conductors, AB and CD, were placed in a 
right lines; with theirends nearly in contacts and a glass 
tube excited by a silk rubber being brought near the end 
A, but not within the striking distance, the ends A and 
C became negative, B and D positive. 
_ But when the conductor AB was removed to some di- 
4tance from CD, and the tube at the same instant removed 
from the vicinity of both; the two conductors became per- 
manently electrified,—AB was negative and CD positive, 
because the excited surface had atiracted the negative fluid 
out of CD into AB, and repelled the positive out of AB 
into CD; and moreover, some part of the positive bad 
been repelled into the air from the end D; for the con- 
ductors became negative, when brought again into con+ 
tact. 
Lynn, Sept. 8, 1813. — Ez. WALKER. 
KXXIX. An Account of a Journey by the Gentlemen at- 
tached to the New York Fur Company, from the Pacific 
Ocean to the Missourt, as collected from the Gentlemen 
themselves. 
Ox the 29th of June 1812 Mr. Robert Steuart, one of the 
partners of the’ Pacific Fur Company, with two French- 
men, Messrs. Ramsey Crooks, and Robert M‘Clellan, left 
the Pacific Ocean with dispatches for New York. 
After ascending the Columbia river ninety miles, John 
Day, 
