Fig. 15. -- Various diets supplied to ducks in 
experiments on lead poisoning: A, corn; B, millet; C, 
small grains; D, smartweed; E, mixed grains; F, tame rice; G, commercial duck pellets. 
rts of leafy aquatic plants helpful in reducing the effects of lead. 
hyllum d 1) | pondweed (Potamogeton pectinatus L.), and duckweed 
Fig. 16. -- Succulent f 
are coontail (Ceratoph 
(Lemna minor L.). 
ope 
