APPARATUS AND GENERAL ADVICE. 19 



in the best authorities, or know from personal ex- 

 perience. All living things act differently under 

 different sets of conditions, although some of the 

 latter may be imperceptibly slight. 



Finally, remember that, whether out in the field 

 or closeted in the developing-room, pains and 

 patience go largely to the learning of something it 

 is useful to know, and to the making of good 

 pictures. 



HOME OF TIIK DIPPER, 



