this, it is necessary that the drawing be made on fairly thin paper.
The _modus operandi_ is as follows: Place the drawing over a piece
of mounted canvas of the desired coarseness of grain, and, holding
it firmly, rub a lithographic crayon vigorously over the surface
of the paper. The grain of the canvas will be found to be clearly
reproduced, and, as the crayon is absolutely black, the effect is
capable of reproduction by the ordinary photographic processes.




CHAPTER IV

VALUES

[Side note: _The Color Scheme_]

After the subject has been mapped out in pencil, and before beginning
the pen work, we have to consider and determine the proper disposition
of the Color. By "color" is meant, in this connection, the gamut of
values from black to white, as indicated in Fig. 23. The success
or failure of the drawing will largely depend upon the disposition
of these elements, the quality of the technique being a matter
of secondary concern. Beauty of line and texture will not redeem
a drawing in which the values are badly disposed, for upon them
we depend for the effect of unity, or the pictorial quality. If
the values are scattered or patchy the drawing will not focus to
any central point of interest, and there will be no unity in the
result.