. The microscope and its revelations. n in use for some years, has received an accession of value fr the employment of immersion lenses. The earliest device for accomplishing this was invented by Professor H. L. Smith, of< Iciiev a, I . . Ihe principle of this illuminator is to employ the objective as 1 i-orkc<lflat, at an angle of 45° to the optic axis, with a rotating diaphragmin front of the aperture admitting the

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901