GENERAL NOTES 



strength for general use. Reduction com- 

 mences at once, and proceeds at times some- 

 what rapidly, rendering a careful watching 

 quite necessary. When the desired amount 

 of reduction is reached, the negative must 

 be removed at once to a bath of sodium sul- 

 phite and water no particular strength being 

 required, to stop reduction, which will con- 

 tinue energetically in the presence of water 

 alone; after which it is to be thoroughly 

 washed and dried as usual. 



"Agfa "-reducer is a recently introduced 

 material, said to possess many very desirable 

 qualities for that purpose. I have not used 

 it, but from the many good words spoken 

 of it, think it well to call the attention of my 

 readers to it. The article, as sold, is highly 

 concentrated, merely requiring to be diluted 

 with ten parts of water for use. Complete 

 reduction takes place in a few minutes, the 

 length of time required being governed by 

 the density of negative to be reduced. 



Mechanical Local Reduction. Occasionally 

 an object which does not present very marked 

 contrasts visually as seen in the microscope, 

 becomes an altogether different subject under 

 the photographic eye; portions of the nega- 

 tive being so dense that no light can pass 



