Abstract
M. MARIÉ DAVY, Director of Montsouris Observatory, has organised, partly at the expense of the French Government, partly at the expense of the City of Paris, a chemical and microscopical laboratory for the analysis of all the matters in suspension in the air of Paris, both quantitatively and qualitatively. A certain quantity of air is constantly aspired by an aspirator in continued operation. The ozone acting on iodide of potassium and starch liberates iodine. The quantity of ozone liberated is measured by a titrated solution of arsenite of sodium. The matters in suspension are collected on a glass plate, and the crop is placed under the object-glass of a powerful microscope magnifying 1,000 times. The principal forms are drawn and plates are executed and published monthly in the Transactions of the establishment. The analysis of rain-water is conducted on the same principles, and the results of chemical analysis are calculated and compared with the wind and other atmospheric circumstances.
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DE FONVIELLE, W. New Meteorological Laboratories at Montsouris . Nature 14, 156–157 (1876). https://doi.org/10.1038/014156a0
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DOI: https://doi.org/10.1038/014156a0