. Acta Academiae scientiarum imperialis petropolitanae. Science. £//? /' ^?l-i:y,i Imp ,>>./ , 1",-/,'/;, -i J7 7B P IZ iVff/fr/r 'rp HL .. 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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