Marvels of pond-life; or, A year's microscopic recreations among the polyps, infusoria, rotifers, water-bears and polyzoa (1871)
Slack, Henry J. (Henry James), 1818-1896 · London, Groombridge · leaf 37
is refracted by it out of the line it was taking,which would have carried it entirely away. Or theobject may be illuminated by an apparatus called aspotted lens, which is a small bulls eye placed under 20 Marvels of Pond-Life, the stage, and having all the centre of its face coveredwith a plaster…
Microscopy · Freshwater animals -- England · Pond animals
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