APPENDIX 1* — Set-up for simultaneously reoording shell movements 

 and rate of filtration of water by the oyster (from Galtsoff, 1946 

 "Reaction of Oysters to Chlorine ti on," Research Report 11, IT. S. 

 Pish and Wildlife Servloe). Constant-level tank (c) with oyster 

 (M)j oonstant-level tank (L) regulating the flow of sea water; 

 float (P) ; mixing chamber (B)j kymograph (K) i floating vessel (t) 

 from which the solution is delivered to the mixing chamberi 

 delivery tube (G) leading from vessel (T) to the mixing chamber j 

 tube (H) for the delivery of sea water; overflow (O). The lower 

 part of the diagram shows dumping vessel (d) (side view at the 

 left and front view at right). The float (P) pushes the lever and 

 releases the catch (A); (detail of the construction of catch is 

 shown at the right lower comer of the diagram). Platform (P) with 

 hook for a thread leading to the writing lever. All parts are made 

 of plastocoel** 



Sco/e ■ r /^/arox 

 F/uid Level- 



\f 



Rttr Support 

 omlttctihert. 



2-B^ 



DUMPING chamber; FROf^r V/SW 



_E- 



-Jl 



■ 



Stsp^ 



Oery^/L OF A 



