Plate, figures 11-23 showing nebulae and stars by Mitchell, B [Bindon Blood] Stoney, and G J [George Johnstone] Stoney Early version of figures 11-23 from plate XXVII showing 13 nebulae discussed in Parsons' paper. The nebulae are drawn in graphite. Figures 11-12 and 18-21 were drawn by Bindon Stoney, figures 13-15 and 22-23 by Mitchell, and figure 16 by George Stoney. The nebulae correspond, respectively, to numbers 393, 421, 689, 629-693, 765-766, 875, 1011, 1052-1053, 1061, 1111, 1113, 1202, 1245, 1306, and 1308 in William Herschel's catalogue of nebulae. Later versions of these figures are found at PT/62/8/46. Subject: Scientific Instruments / Astronomy Published in Philosophical Transactions as 'On the construction of specula of six-feet aperture; and a selection from the observations of nebulæ made with them'. Received by the Royal Society on 5 June 1861. Read 20 June 1861. [1861]