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A New Type of Entomological Killing-Bottle
Published online by Cambridge University Press: 10 July 2009
Extract
The “cyanide bottle” is never a very attractive part of the entomologist’s equipment. When made up in the old way, i.e., plaster of Paris poured over lumps of solid potassium cyanide and the plaster then allowed to set, the contrivance has an attractive appearance, but is an abomination to use, especially if small insects are being dealt with. The large amount of water utilised in making up the plaster of Paris can never be dried out properly, and the potassium cyanide being deliquescent to some extent the presence of moisture is unavoidable. Moreover the cyanide soon decomposes and turns brown, imparting its colour to the plaster and forming an ugly-looking mass on which small insects, are not contrasted and may be easily overlooked and lost.
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