From measurements made by Professor Hall, it is found, with a near
approach to certainty, that the mass of Mars is equal to 1-3,090,000th
part of the mass of the sun. This result was arrived at after only ten
minutes of calculation, and is believed to be more nearly accurate
than that obtained by M. Le Verrier, the great French astronomer, from
observations continued through a century and after several years
of laborious calculation by a corps of computers. This wonderful
difference in the expenditure of time and labor is due to the
vigilance of Professor Hall and to the admirable qualities of his
instrument, the great twenty-six inch refracting telescope made by
Alvan Clark & Sons.
* * * * *
Oakland, Cal.
DEAR ST. NICHOLAS: I do not wish to make you any trouble, but I
would like it very much if you could find room in some number
to give a good explanation of the great war in Europe. I can't
understand it in the newspaper, but I am pretty sure you can make
it plain and simple enough for all of your young readers.
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