DUST. 
3 
proved by delicate experiments that when all dust was 
removed from the track of a beam of light, there was 
darkness. So before the command, “Let there be 
light,” the dust condition of light must have been pres¬ 
ent. Balloonists find that as they ascend higher the 
color of the sky deepens. At a distance of some miles 
the sky is nearly black, there is so little dust to scatter 
the rays of light. If the stellar spaces are dustless, 
they must be black, and therefore colorless. The mois¬ 
ture of the air collects about the dust-particles, giving 
us clouds, and with them all the glories of sunrise 
and sunset. Fogs, too, are considered to be masses 
of “water-dust,” and ships far out at sea have had 
their sails colored by this dust while sailing through 
banks of fog. 
Astronomers find meteoric dust in the atmosphere. 
When this falls on the snow and ice fields of the Arctic 
regions it is readily recognized. The eruption of Kra- 
katoa proved that volcanic dust is disseminated world¬ 
wide. 
An old writer has said: “The sun discovers atomes 
though they be invisible by candle light, and makes 
them dance naked in his beams.” 
Thus dust, just common every-day dust, is a very 
important and complex substance, which promises 
much of interest in its study. Therefore, again we ask 
where does it come from and of what is it made ? 
When a March wind blows over a sandy road or a 
November gale sweeps through city streets, it is evi¬ 
dent that a large part of the dust found in the house 
Meteoric 
Dust 
Source 
of Dust 
