8 A. COTTAM ON AUTOGRAPHIC LITHOGRAPHY, &C. 



warm rub the ink upon it ; the heat will dissolve a small portion. 

 Add water to what you have rubbed, but do not rub the stick in water. 

 The ink should not be used too thick, and should work freely. A 

 pen or brush may be used to draw with, but a fine sable brush is by 

 far the better tool. With a brush there is no fear of injuring the 

 surface of the paper, and with a little practice much finer lines can 

 be drawn with a brush than with a pen. The crayon can be best 

 brought to a fine point by rubbing it down on a piece of emery 

 cloth. 



The drawing should be transferred to stone as soon as convenient 

 after being completed, as the ink seems to lose its virtue after a time. 



As to cost — a plate the size of our "Proceedings" can be trans- 

 ferred to the stone for about 5s. or 6s., and can then be printed on 

 good plate paper for about 6s. a hundred, including the cost of the 

 paper. 



