. comptesrendusheb1061888acad. es naturelles. catrice rectiligne et à l'enregistrer dans les mêmes conditions que la spirale : la Jig. 2 est la reproduction (procédé Dujardin) d'un cliché pliolograjihique obtenu comme précédemment {loc. cit., t. GIV, p. i665); elle représente les axes coordonnés rectan- Kiï. '1. Fia. 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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Keywords: ., book, bookcentury1800, bookdecade1880, bookpublisher, bookyear1888