176 MARVELS OF FISH LIFE 



scenic negative are combined to make a single print 

 or lantern slide. 



Two tanks are placed on the wooden platform 

 already mentioned, and stones and weeds are arranged 

 in both the tanks and on the platform. The water 

 in the front tank is next stirred up so that everything 

 is obscured. By the time this water has partially 

 cleared, the weeds (which when first put in were limp 

 and drooping) have freshened up. As soon as the 

 water has cleared sufficiently to show the weeds in 

 the front tank, the first photograph should be taken. 

 A second should be taken when the weeds in the tank 

 behind it are also showing, and a third exposure made 

 when the weeds in both tanks and the stones on the 

 platform are visible. In this manner three scenic 

 negatives can be obtained from a single tank arrange- 

 ment. 



If a dark background is required in order to show 

 up a silvery fish, the canvas screen behind the plat- 

 form should be thrown into shade by tacking a sheet 

 from the top of the canvas background to the top of 

 the tank. 



The method of combining a fish negative and a 

 scenic negative together so as to make a single print is 

 as follows : — 



First make a transparency of the fish negative. 

 This transparency will show the fish on clear glass. 

 Next carefully block out the whole of the fish with 

 colour on the film side of the transparency. Then 



