ILLUSTRATIONS
1 Sectional view of a general-purpose aquarium
building
16
2 Sand filter for removal of silt and other fine matter
21
S Screen filter for removal of fishes and other larger
biotic pollutants
22
4 A suction drain which permits cleaning bottom of
tanks
24
5 Arrangement of overflow to secure proper circulation of water
25
6 Agitator for aerating aquaria and hauling tanks
62
7 The air-lift pump is of value in filtering water of
small individual tanks
63
8 Hauling tank designed for a pick-up truck
79
1 Sectional view of a general-purpose aquarium
building
16
2 Sand filter for removal of silt and other fine matter
21
S Screen filter for removal of fishes and other larger
biotic pollutants
22
4 A suction drain which permits cleaning bottom of
tanks
24
5 Arrangement of overflow to secure proper circulation of water
25
6 Agitator for aerating aquaria and hauling tanks
62
7 The air-lift pump is of value in filtering water of
small individual tanks
63
8 Hauling tank designed for a pick-up truck
79