A Popular Handbook of the Microscope. By Lewis Wright. (R.T.S.)—The
improvement in microscopes in regard to the accessories of illumination and the mechanical part of the in- strument progresses fast. Arrangements that a few years ago were common, are now looked upon as clumsy. A great deal of attention is paid by Mr. Wright to the management of light, and it is needed (though he is a little too technical perhaps), for many microscopic objects under great magnifying power do not reveal their details properly. The medium of ground glass, for
instance, is as important in diffusing the light and refining it, as a shade over the electric light is in softening it. There is much useful information about the study of pond and marine life, and insect life, and the manner of obtaining interesting subjects, in Mr. Wright's book, and we recommend the student who is without a handbook of this sort to get it. It is technical occasionally, but the student may neglect such portions.
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