PROPAGATION OF WILD-DUCK FOODS. 
15 
Fig. 9. — Potamogeton natans. 
Fig, 10. — Potamogeton lucens. 
Fig. II. — Potamogeton lieterophyllus. Fig. 12. — Potamogeton lonchites. B397M 
Figs. 9-12. — Wide-ranging species of pondweeds. (From Morong.) 
