174 MARVELS OF FISH LIFE 
I have often attempted to photograph the fish in 
a public aquarium, but have found that it is practic- 
ally impossible to avoid the reflection of the tanks. 
In aquaria with a good top light a sheet can be attached 
to the top of the tank and carried over the photo- 
grapher, as shown in the second plate facing page 24. 
In this manner not only is the reflection avoided, but 
the fish are seen illuminated as in Nature. In most 
aquaria, however, there is insufficient light for photo- 
graphy of moving objects. 
