London: Royal Society of London, 1787/1821/1833. Three Quarter Leather. First Edition. Volume I: Vol. 1-70. 801 pp. 8vo. Volume II: Vol. 71-110 & 111-120. 225, 101 pp. 4to. Library binding, tan leather spine with gold embossed titling, call number labels on each volume. Interiors clean, ex-library stamp on title page, and occurring sporadically within. Pages were trimmed slightly when rebound. Very Good.
Complete printed indexes of Volumes 1-120 of the Philosophical Transactions of the Royal Society of London. Each index arranged in two formats, alphabetical by subject and alphabetical by author. Rare in having three complete indexes (in two volumes) covering the years 1665 to 1830, Vol I: 1665-1780; Vol. II 1781-1820 & 1821-1830.