. Acta Academiae scientiarum imperialis petropolitanae. Science. ^'" ^'''"'^- ^'"y ->'? ^'?'^^-/ r.„. M. TaA y-. 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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