254 O.N. Rood on Combination of Light of different tints. 
into the molecular atmospheres, one after another, and are finally 
radiated off as heat-pulses. The explanation is the same as that 
of the molecular absorption, and subsequent radiation of the 
ethereal pulses of radiant heat, already given (p. 215). When 
the condition of things is such that the particles in the circuit 
become polarized, a greater amount of heat should be developed, — 
because a part of the electric movement within the molecular 
atmospheres, which was before confined to their upper portions, 
now occurs at greater depths, where the universal ether is more 
dense. Thus, when the resistance to the passage of the current 
becomes greater, more heat is developed. Heat. may also be 
adjacent masses,—and inducing currents in wires, or mevlig 
bodies, in the vicinity. 
[To be continued. ] 
Art. XX VITI.—On the combination which takes place w 
hen Light 
of different tints is presented to the right and left eye; by Prof : 
OapENn N. Roop, of Columbia College. 
In 1806, de Haldat stated that when differently colored glasses 
were held before the two eyes, a combination of the two per 
took place in the brain, and that the resultant impression 1" 
the same that would have been produced by mixing a we 
observers 
; ¢ de Haldats 
lariscope, Dove confirmed the general correctness 0 
conclusion. In 1846, Seebeck, and, in 1849, Foucault and Reg 
nault arrived at the same result. 
The testimony of these observers has then proved peste , 
bination of the two sensations does take place in the bral 
erally similar to that which would be produced by the geo . 
bh what exac® 
tion of the two tints to a single retina: but wit 
tude the resultant tint obtained by the binocular meth or bY : 
with that produced in the ordinary way by rapid rotation, 
mete tthe et 
