THE CONSERVATION OF OUR OYSTER SUPPLY. 15 



r|l 



Fig. 10. Examining a Tile covered with Uvsteii Si'at. 



ponds ; but the result in the latter seems to be much more satis- 

 factory. The pond, having been macadamized, is first thoroughly 

 dried " for two months, . . . doing away with all animal and plant 



Fig. 11. Disengaging Seed Oysters from a Tray Collector. 



