Chemistry and Physics. 277 
different from what science taught. That is, that there were greater in- 
tervals between them than Newton had demonstrated and scientific men 
ite proportions for each shade of color. That is, supposing white 
light to consist of the motion of an ether, blackness to consist of an en- 
nee of motion, then a certain color, blue, red, or yellow, will be 
produced by the alternate action of the light and the shadow. The au- 
thor ed shadow in the positive sense as the sensation was positive. 
1 pursuing the inquiry, he first caused a small parallelogram cut in 
ard to revolve over a black surface with a rapidity which he con- 
equal to the vibration of light. By this motion he obtained a 
blue, while at another time in different weather he obtained a 
Hi veral ntric rings, which he 
= cies 4, $, , and 4 black, leaving the remainder white, 
a Tl 4 
in cil lamp with a reflector. The author said that they were edith 
ag, 2S another set of experiments which the author considered as 
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“by Produce alternate beats of light and shadow when put in revolution. 
then on et * oe sogti of different shades, and Apaegertoectens cou 
' aul, like t e prism, he cal em spec- 
ta by reflection, e spectrum from the prism, pec 
Wack oe also that the colors may be produced by making a 
Thite se, with figures cut out of it, revolve before a white cloud or 
: Screen, 
les to Were many others which he had no time to enumerate, much 
*scribe, but he described some of the figures which produce the 
“a. Which are perceived when looking through transparent solids. 
en}, -Uthor considered that his theory gave an entirely new-and simple 
Ps ton of the phenomena of refraction through the prism, and 1 
“P88 follows -— 
€xperiments prove the homog neity of the ether. 
They prove the undulatory Pa but oppose the undulatory theory. 
