372 F. E. Stimpson on Farmer's Theorem. 
their satellites. When the novel and entertaining observations 
with the spectroscope have received their natural abatement 
and been assigned their proper place, it is to be hoped that 
some of the powerful telescopes recently constructed may be 
devoted to this class of observations, where a rich and an ample 
field awaits the skillful observer. One could not wish a better 
example than the beautiful work of Bessel on the satellites of 
Jupiter. 
August 2, 1870. 
— 
Art. XL.—Farmer’s Theorem discussed; by Frep. E. 
STIMPSON. 
Jour., xlix, 17), is the following:—‘ A comparison of the 
foregoing results will show that the coincidences, with the 
requirements of the theorem of Farmer are, within the limits 
assigned, too numerous, and too closely accordant, to be 
a as otherwise than pointing clearly to its general 
trut ” 
What I propose to examine now is, whether the data given 
in the paper referred to, do warrant the conclusion reache 
ecording to the data given for the first experiment, two 
lights were made equal, so that the disk of a Bunsen Photo- 
meter stood midway between the flames, and the consumptions 
were found to be 3°66 feet per hour. 
“The screen was then moved upon the bar to a point just 
four times as far from one flame as it was from the other, 1. &, 
the bar being 100 inches, the screen stood at 80, i. ¢., as 1:4 
The light from the distant burner was then increased, until the 
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