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5

was carried out for line-engraving and etching, which filled respectively, frames 3 and 4, and frames 5 and 6. The later processes, the origin or at least, the general acceptance [[strikethrough]]of which[[/strikethrough]]and development of which dates from the 17. and succeeding centuries, had to be treated even more summarily. Thus frame 7 was devoted to mezzotinting; frame 8 to dry-pointing and aquatinting; frame 9 to the crayon manner and stippling; frame 10 to lithography, and frames 11 and 12 to the various photo-mechanical processes. Frames 13 to 16 constituted a special division in which the attempt was made to give some idea of the history of color-printing. 
Small and inadequate as this exhibition was, its usefulness was still further crippled by the impossibility of having the descriptive pamphlet printed which had been prepared, and without which the fragmentary character of the col-