Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 76
y organic substances. A starchgranule can always be recognised by its means, as it shows underpolarised light a black or coloured cross, due to the crystaUinerefraction of the material. Sugar and other crystals displaybrilliant colours, and such materials as horses hoofs, wax, orfinger-nails, show… … of the theory of light, which is not within the scope of thisbook. An eyepiece with a movable pointer or indicator (Fig. 83) is Demon-, a useful aid to teaching. It consists of an eyepiece magnifying ly^w.X 10, which has a fine movable indexwhich can be made to point to any portionof an object…
Microscopy
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