Optical Glass Committee Meetings held; 1. 31 December 1829 2. 30 April 1831. On back inside cover, lists ' Meetings of Sub Committee, 1 to 12 in Volume 1 of Minutes; 13 to 23 in Volume 2 of Minutes; 24 on page 45 present Vol. Lists ' Reports in this volume; Sixth Report page ___ date--- ' 31 December 1829 to 30 April 1831