136 DEFECTS IN NEGATIVES. 



negative directly. When this is the case, the weak 

 negative should be copied in the enlarging appara- 

 tus (to be described), using a very weak illu- 

 mination. A positive will be obtained which on 

 development will be at all events as dense as the 

 negative, and when intensified much more so. If 

 then another copy be taken from this positive, a 

 negative is obtained, very much denser than the 

 original negative. 



This simple enumeration will be sufficient to en- 

 able any intelligent person to avoid the defects 

 mentioned, or to apply the proper remedies for them. 

 For fuller imformation we refer our readers to any 

 of the numerous text books on this subject. 



