The microscope : its construction and management : including technique, photo-micrography, and the past and future of the microscope (1893)
Heurck, Henri van, 1838-1909 · London : C. Lockwood ; New York : D. Van Nostrand Co. · leaf 312
oftheir existence. About twenty years ago, after prolongedobservations of the suns disc, the retina ofour eyes became congested, and flying fliesbecame so abundant that for a long time wewere unable to devote ourselves to anyProfessor Harting advised us to adapt an elbowocular to our microscope, so… … Fig. 185.serious observation. 292 DEFECTS OF THE EYE. When much annoyed with flying flies the best course is to suspendobservations. A few minutes rest is sometimes sufficient to restore theeyes to order. We therefore repeat that there is no reason to feel anxious aboutflying flies; they are not…
Microscopy
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