. Acta Academiae scientiarum imperialis petropolitanae. Science. -y^cta, . jlaui . J^p . Jc . Feffep ? Taiti .1. J',.2i' Tai ~\,T. 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 Imperatorskaia akademia nauk (Russia). Petropoli, Typis Academiae scientiarum

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