148 Dr. Pearson’s Experiments and Observations 
above mentioned, its bulk was instantly diminished, in some 
cases -j-f-, and in others 
C. 1600 interrupted discharges, by means of a thirty-two 
inch plate machine, produced, from New River water and dis- 
tilled water freed from their air by the air pump, a column of 
gaz about three-fourths of an inch in length, and one-ninth 
of an inch in diameter, in the space of three hours. It was re- 
duced in bulk by passing through it a single electric spark. 
D. 500 revolutions of the thirty-two inch plate machine, in 
three quarters of an hour, produced 600 interrupted discharges 
in river water, freed from air by the air pump, by which a 
column of gaz, half an inch in length and one-tenth of an 
inch in diameter, was obtained. It was diminished, as usual, 
by an electric spark, ^ of its bulk. 
E. Nearly four days incessant labour, with the thirty-two 
inch plate machine, produced only 56,5488 cubes of gaz, of 
one-tenth of an inch each ; on account of the usual accidents 
during the process. The air had been exhausted, by setting 
the water under the receiver of the air pump. 
F. It was found that 6000 interrupted discharges produced 
about three inches in length of gaz, measured in a tube of 
an inch in width, from water out of which its air had been 
drawn by the air pump. 
G. It appeared, from many experiments, that the same un- 
boiled water, or water from which the air had not been exhausted 
by the air pump, which had repeatedly yielded gaz by passing 
through it electric discharges, always left a residue of gaz, 
which the electric spark did not diminish ; and this residue w'as 
in nearly the same quantity, after six or seven experiments, 
each of which afforded a column of gaz, half an inch in length. 
