Theserequire to be kept in vessels of considerable dimensions,which renders it difficult to select any particular specimen,as is also the case with the more minute ones in phials.For effecting this purpose Ledermuller has described andfigured in plate 87 of his work a very ingenious contriv-ance ;… … immerse the lower end in the vessel of water, and theinstant the insect desired approaches the end of the tube,remove the thumb from the upper end, and the pressure * See Notes on Natural History. 162 MICROSCOPIC OBJECTS. of the atmosphere will force the water with the insectup the tube, when the…
Microscopy
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