This however was of only a few
hours' duration, and was only visible in favorable localities.
Here again we see the advantage of the weather maps; but for this map we
would never have been able to have satisfactorily explained the peculiar
phenomenon produced by the great Michigan fire.
If the delicate redness of the sky is not caused by dust, what is it
caused by?
But for the weather map, I think we should still be in the dark in
regard to it.
In the first place, this redness is nothing new, only the conditions
are more favorable sometimes than at others. It has always existed and
always will exist, independent of earthquakes, volcanoes, etc. Nature
is ever changing; the movements of the atmosphere more resemble the
kaleidoscope than any thing else.
The summer and fall of 1883, the movements of "high" (high barometer)
over the United States were quite central and extensive, causing this
peculiar phenomenon over a wide extent of territory.
We have no information of the condition of the barometer over the other
part of the world; we speak move particularly of the United States; yet
if certain conditions produce certain effects here, it is quite safe to
say that the same effects are produced by the same cause elsewhere.
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