31. Add MS 46151 Y Reference (shelfmark): Add MS 46151 Y Title: Scope & Content: (ff. 24). Lecture (un-numbered) (on Optics); n.d. (wm 1814). Autograph. Collection Area: Western Manuscripts Languages: English Date Range: [1806-1902] Extent: 1 item
32. Add MS 46151 Z Reference (shelfmark): Add MS 46151 Z Title: Scope & Content: (ff. 20). Lecture (on Perspective) in which was inserted Lecture iii (M above); n.d. (wm 1814). Autograph. Collection Area: Western Manuscripts Languages: English Date Range: [1806-1902] Extent: 1 item