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doi: 10.1038/013007c0
I HAVE just received from the Meteorological Observatory at Upsal, Sweden, a number of blank forms (with instructions in English) for observations of the directions of the cirrus cloud. Copies of these forms I shall have much pleasure in supplying to anyone who may be willing to make observations of these clouds, the systematic and extensive observation of which is, as you pointed out in a recent number of NATURE, of such importance in numerous meteorological inquiries.
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