516 The Velocity of Light. [September, 
molecular transport; it can at best be reflected, and re- 
transmitted, and even then the solid molecules reacting upon 
outside matter as re-transmitters of light must assume a 
centrifugal tendency, developing a molecular atmosphere 
and sea, &c. 
When any particle is on the side towards the sun, and the 
latter, then aCting negatively on it, gives it alone, or in 
common with other heavenly bodies or purely terrestrian 
molecular combinations, all under solar supremacy, the 
tendency is towards the velocity vg r of absolute centrifu- 
gality ; this tendency increasing molecular rotation, heat, 
opposed to plain gravity, g, will move it from west to east. 
Immediately after, however, the particle lifted towards the 
sun, made more solar, receives a tendency to an accelerated 
motion in an orbit round the sun from east to west, to a 
velocity greater than the mean one, B, of the whole earth 
in her orbit round the sun, and therefore in advance of the 
earth, and opposed in direftion to the tendency vgr of the 
particle. Terrestrian and solar centrifugality at once re- 
acting, the former against solar attraction and lifting, the 
latter against terrestrian centrifugality moving the particle 
away from the sun in front of the earth, or so tending, and 
aCtual transport of the particle being thus prevented, there 
will be vibration only according to the qualities of the 
stratum of which the particle forms part, and the qualities 
of the particles and of the enclosing and underlying strata, 
the resistance of less elastic against more elastic molecules. 
All the qualities of strata will possess certain respective 
proportionalities as long as the contiguity of the terrestrian 
mass is not entirely destroyed, — as we may observe it with 
comets when they are dispersed into nebula and split into 
separate masses. 
When the particle is on the side of the earth away from 
the sun, and therefore receives the tendency towards the 
velocity vgr only by reflected light (aCtion), or by own 
light from third bodies outside or inside the limits of the 
atmosphere, the tendency will still be in the sense of rota- 
tion of the earth, but east to west, and the particle lifted 
from the earth will have the tendency to slacken its motion 
round the sun, and to stay behind the mean motion, B, of 
the earth round the sun. Earth and sun, however, now 
combining in re-attraCting the particle towards the earth, 
the mass of both being more or less between the particle 
and the sun, there will be again an opposite tendency of 
motion of the confined particle, a wave motion, propagating 
the impression from the respective light generator, We 
