In two cases, however, it has been found in the absence of appreciable quantities of uranium and thorium compounds, namely in beryl, and in sylvine (potassium chloride).
The general conclusion would appear to be that, while as seen from the earth's surface much of the light from the sky is due to comparatively gross suspended matter, yet an appreciable proportion is attributable to the molecules of air themselves, and that at high elevations where the blue is purer,
It is, however, fair to assume that the comparison stars will rarely have a parallax as great as o oi ; for it must be remembered that it is quite the exception for a star taken at random to have an appreciable parallax; particularly if a star has an ordinarily small proper motion, it is likely to
The growth of a wider patriotic sentiment must depend on the spread of popular education; certainly up to 1908 no appreciable progress had been made in this direction.
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