(Petropoli (St. Petersbourg), 1750). 4to. Uncut, without wrappers. Extracted from ""Novi Commentarii Academiae Scientiarum Imperialis Petropolitanae"", Tom. I. ad Annum 1747 et 1748. Pp. 337-352 a. 1 large engraved plate (40x31 cm.). Tear to folding on plate, no loss. Clean and fine.