68 PRACTICAL PHOTO-MICKOGKAPHY. 



complete instructions will be found in " Processes of Pure 

 Photography." 



A dozen or two of ordinary portrait gelatine bromide plates, 

 a dozen or two of very slow thickly-coated plates, and a dozen 

 or two of " color-sensitive " plates, will form a sufficient stock 

 for a beginner. If the reader is au fait in the wet collodion 

 process, he will do well to try it in order to satisfy himself as 

 the writer did as to the relative advantages of wet coflodion 

 and dry gelatine. 



The greatest mistake that can be made is to change from 

 one make of plate to another without very weighty reasons. 

 The beginner, especially, should stick to one make of plate 

 and work with it till he can work it well. There are few 

 plates in the market that will not yield a perfect negative 

 when properly used. 



