Diver, polar 193 



Diver, rednecked 192 



Division of carp-pond surface 78«-, 79 



Division of trout-pond surface 125 



Drag nets 173 , 191 



Drag-net, cloth 173, 176 



Dragnet cloths 173 



Dragon flies 33, 3^, 35 



Drainage 60, 61, 158, 181 



Drainage fish-ponds , 172 



Drainage waters , putrescible U9 



Draining 173, IIU 



Dreilig reed scythe 155, 156ft 



Dried fishes 133, 139 



Dropsy of the abdomen 63, 181, 202«, 203 



Dropsy of the vitelline-sac 102, 197, 199* 



Dry spleen 1^2 



Dry foodstuff mixtures 136, 137 



Dry yeast 138 



IXibisch pond , 80 



Dubis ch procedure 80 



Ducks 193 



Ducks , wild 193 



IXickweed (Lemna minor) 42 



Duration of water coverage 35, 36, 60, 61, 130, 184., 191 



Dwarf bittern 192 



D?ra.rf diver 192 



Dwarf merganser ...,., 193 



Dwarf plankton 44 



Dwarf sheatf ish 14 



Dystrophic pond , 31 



Dytiscus (yellow edge) 34. 



Ear snail (Helix auricularia) 13 



E^red grebe or diver 192 



Early fish-out of nursery ponds 83 



Earth reservoir » 180» 



Earth worms 143 



Eastern brook char (Salmo f ontinalis ) 98 



Eaters of large plants 3^ 



Eaters of plankton animals 11 



Eaters of plankton plants 34 



Eaters of plants , 11 



Eaters of shore animals 11 



Eaters of submerged algae 34 



Eaters of vegetation-animals 11 



Eating space 40 



Echinorhynchus 209 



Eel 191 



Egao-groats 143 



Egg box 117 



Egg count 81, 102, 103 



Egg losses 117 



Egg pincettes 120* 



Egg pipettes 120* 



Egg shells , accumulation of , 198 



Eggs and milt, amounts in trout 102 



Eggs, cleansing of the 117 



Eggs, fertilization of 106, 107 



Eggs , selection of small , 117 



Eggs , selection of trout 118» 



Eggs, shipment of 109, 117 



Eggs, sizes of 102, 103, 104 



237 



