212 The Ohio Journal of Science [Vol. XVII, No. 6, 



This brings up the question of lettering. The letters used 

 with a drawing or photograph that is to be reduced in repro- 

 duction must be chosen with the reduction in mind. Any shad- 

 ows as of edges of paper can be removed from the zinc plate if 

 they are far enough away from structures that must be kept so 

 that the graving tool can cut them away. If none of the 

 natural background of a structure in a photograph is wanted, 

 the structure must be carefully cut out of its setting with a 

 sharp instrument and pasted on a white surface. The lettering 

 can then be placed on this. Cut-out letters of almost any size 

 with gummed backs can be pasted on a plate unless this is to 

 be rolled. Rolling up is likely to spring the letters off from their 

 particular place and so ruin the labeling. 



One will learn the method with which he is most successful 

 by trial. Care in making drawings will always be repaid in the 

 appearance of the printed paper. For the beginner ink-drawn 

 text figures will probable be the most satisfactory. Photo- 

 graphs should be printed out by a method which will reproduce 

 successfully. Those papers which have bluish tints should be 

 avoided and also those which are finished with a gloss. 



Miami University. 



