. Acta Academiae scientiarum imperialis petropolitanae. Science. stcta ? .-tcad I»tp ^c . Tetiyppl . Tom JL r 1 lat .~XJ~T . J-7,1. J/. 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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