27. Luminous ink that will shine in the dark, 28 28. To make a writing appear and disappear at pleasure, 29 29. To make a writing vanish and another appear in its place, 29 30. To restore old writing that is nearly defaced, 30 31. To paint a picture that will appear and disappear occasionally, 30 32. Landscape painting on walls of rooms, 31 33. To paint in figures for carpets or borders, 34 34. To paint in imitation of mahogany and maple, 35 35. The art of painting on glass, 36 36. Best method of polishing steel, 37 37. To make letters of blue on polished steel, 38 38. To preserve the brightness of polished steel, 39 39. To give steel a temper to cut marble, 40 40. To wash iron or steel with copper, 41 41. To give iron the whiteness of silver, 42 42. To wash iron with tin, 42 43. To give tin the whiteness and brilliancy of silver, 44 44. To crystallize tin, 44 45. To make a gold coloured varnish for tin, 45 46. To make shellac varnish for japanning, 46 47. To make the best copal varnish, 47 48. To make a spirit varnish for maps, 48 49. To make elastic varnish for umbrellas, 49 50. To varnish maps and pictures, 49 51. To make brunswick blacking, 50 52. To make a print appear on a gold ground, 51 53. Best method of tracing or copying a picture, 52 54. The construction and use of a copying machine, 53 55. To produce the exact likeness of any object instantly, 54 56. Copper plate engraving, 57 57. Etching on copper plates, 60 58. Engraving and scraping in mezzotinto, 63 59. Etching in aqua-tinta, 64 60. Copper plate printing, 65 61. Etching letters and flowers on glass, 67 62. To print figures with a smooth stone, 68 63. To cut glass with a piece of iron, 69 64. Best cement for joining glass, 70 65. Best cement for joining china or crockery, 70 66. To make a strong water proof glue, 71 67. The art of moulding figures in relief, 72