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1 From the Department of Animal and Plant Pathology of the Rockefeller Institute for Medical Research, Princeton, N. J.
The larvæ of the yellow fever mosquito, Ædes ægypti, are able to utilize substances in true solution. They require for development at a normal rate a proper concentration of calcium chloride, known to exist in water as a solute. Their growth is likewise conditioned by an organic growth factor shown to be also a solute. Finally, the larvæ can develop at least as far as the fourth instar in media the nutrients of which exist entirely in true solution.
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