SOURCES OF CONTAMINATION. al 
G A # iit Ws 
MA OMIT, 
Fic. 2.—Oyster floats in sheltered artificially constructed inlets from the bay. The water of the sea does 
not have the same cleansing action on coves of this kind as where action of the waves and currents is 
unobstructed. 
ing them for varying periods of time in water of a questionable 
character before marketing. Fortunately this custom is being dis- 
couraged or prohibited in some localities. Generally speaking, how- 
ever, these floats are located for convenience rather than safety. 
They are constructed with slatted bottoms having an area of about 
20 by 40 feet, the sides being 14 feet in depth, and are usually found 
anchored near the oyster establishment, where water is of a brackish 
or moderately. fresh character, and where the chances of sewage 
pollution are greater than in the places where the oysters normally 
crow to maturity. 
Fig. 3.—An abandoned oyster float. 
