. comptesrendusheb1341902acad. es naturelles. SÃANCE DU l" AVRIL 1902. 701 » Toutes choses égales d'ailleurs, il doit donc se produire dix aurores boréales à l'équinoxe pendant qu'il s'en produit neuf au solstice. Fis. 1. JHrection de- la rotatioa de- la ^Ãyyie-'., > Jou I*. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original nce Periodicals; dicals.

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