ILLUSTRATIONS FOR PUBLICATION 193 



with the negative; and a contrasty paper for the print. For good re- 

 production, the print should look too hard for an artistic picture. 

 Overdo it just enough to offset the flattening which the halftone proc- 

 ess cannot avoid. If the page width of the journal in which the illus- 

 tration is to appear is 4 inches, do not use a negative smaller than 

 5X7. If you have no camera larger than a 3|X4j, get an 8X10 en- 

 largement on glossy paper. If your camera is smaller than 3jX4j, 

 try to describe the situation. Good English will be better than poor 

 illustrations. 



There are many other methods of reproducing drawings and photos, 

 but the practical investigator had better learn to make copy for repro- 

 duction by the zinc etching and the halftone, and work on reproduc- 

 tion by the photolithographic process to show details of chromosomes 

 and the structure of cytoplasm and similar difficult features. 



