Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 38
found speciallyvaluable for the examination ofliving bacteria, rhizopods, and othertransparent and unstained speci-mens that are difficult to see withdirect light. Such objects, however,due to their transparency, reflectonly a small portion of the lightthat falls upon them, and a strong… … Fia. 25.—No. 3294, FocussingDark-ground Illvuninator, 36 THE MICROSCOPE To centra It is therefore necessary that a centring adjustment should tok?^Mabe provided, so that the illuminated point may be exactly inilluminator, the field of view. If the substage of the microscope is not pro-vided with a…
Microscopy
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