, can not only be
seen to greater advantage, but their parts can be more easily studied.
As its cost is merely nominal, it can be applied to every instrument,
large or small; and when its merits and its utility by practice are
known, I am confident that it will be considered a valuable accessory to
the microscope."
* * * * *
Prof. W.O. Atwater, as the results of a series of experiments, finds,
contrary to the general opinion of chemists, that plants assimilate
nitrogen from the atmosphere. They take up the greatest quantity when
supplied with abundant nourishment from the soil. Well fed plants
acquired fully one-half their total nitrogen from the air. It seems
probable that the free nitrogen of the air is in some way assimilated by
the plants.
* * * * *
A catalogue, containing brief notices of many important scientific
papers heretofore published in the SUPPLEMENT, may be had gratis at this
office.
* * * * *
THE SCIENTIFIC AMERICAN SUPPLEMENT.
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