114 THE A B C OF PHOTO - MICROGRAPHY 



latter too long. A short, but, of course, 

 sufficient exposure, with comparatively long 

 development, will give clearer high lights and 

 more transparency in the shadows than the 

 reverse; but be careful to avoid under-ex- 

 posure, as no amount of forcing or other 

 manipulations will ever give satisfactory re- 

 sults if the light has not acted its part upon 

 the sensitive emulsion. Experience and prac- 

 tice alone will give proficiency in this some- 

 what difficult and always delicate work. You 

 must be prepared for and expect some fail- 

 ures, since you are certain to meet with them ; 

 but be not discouraged; success is sure to 

 attend upon patient, persistent effort. The 

 spoiled plates need not be wholly wasted. 

 After keeping them long enough as " fright- 

 ful examples and warnings," the films may be 

 cleaned off by hot water and the plates be 

 used as cover-glasses for other slides. 



All lantern slides should be varnished, but 

 not before making sure they are worth pre- 

 serving and -require no further doctoring, as 

 they may do in the way of local intensifica- 

 tion or reduction, toning, etc. I do not deem 

 it necessary to give directions here, since they 

 are so fully detailed in the books accessible 

 to all at this time. A thin, clear varnish, 



