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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 68. To cast images in plaster, 73 69. To produce embossed letters on marble, 74 70. To soften stone, 75 71. To change wood, apparently, to stone, 76 72. To render wood, cloth or paper, fire proof 77 73-75. To produce fire readily, 77 76. To make super-combustible matches, 78 77. To make gun powder, 79 78. To make the common fulminating powder, 80 79. To make mercurial fulminating powder, 80 80. To kindle a fire under water, 82 81. To light a candle by application of ice, 82 82. To form letters or flowers of real flame,