Bull. U S. F. C. 1891. European Methods of Oyster-culture. (To face page 406.1 
Plate LXXXIII. 
Fig. 1. Berqen-op-Zoom, Holland. View from the Dike across Polder Land now in 
use for Oyster Ponds. 
The rough pond in the foregrou nd is emptied and filled tidally from the main canal without. The incoming 
muddy water here deposits a portion of its silt, and thus purified passes into the long, narrow reservoir pond to 
the right of the center of the picture, also into a similar reservoir pond whose sluice is seen at the left. The 
water thus reserved and enriched by the growth of food organisms, is daily fed to the larger pond, which indi- 
cates at the water surface the position of culture cases. (Page 386.) 
Fig. 2. Bergen-op-Zoom, Holland. An Establishment neighboring and similar to the 
last. Workshops in the background with Reservoir Ponds. 
The cultural pond in the middle is traversed by beams which facilitate the transport of oysters to different points of 
the pond. Tiles about to be put in use for collecting spat are arranged for storage at the right. 
