Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 319
per will afford adark background ; whilst objects mounted on the small black discssuitable to the Lieberkiihn may conveniently rest on it, instead ofbeing held in the stage-forceps. Growing Slides and Stages.—A number of contrivances have beendevised of late years for the purpose of watching the… … Fig. 246.—Becks disc-bolder. GROWING SLIDES 289 multiply themselves in particular fluids. One of the simplest andmost effective, that of Mr. Botterill, represented in fig. 1^17, con i t ,of a slip of ebonite, three inches by one, with a central aperture ofthree-fourths of an inch at its under side…
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