. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. EXPERIMENTAL STUDY OF THE OYSTER GILL 26 The oyster was immobilized b}' plaring it on a brick and embedding its left shell in a mixture made of 1 part of cement and 3 parts of plaster of Paris. A glass rod, attached bj' means of the same mixture to the right valve of the oyster, was connected to the lever of a recording apparatus (fig. 9) and the oyster was kept in a large aquav â¢/â¢iitv â rut --:!â r. Fig. 9.âMethod employed to study the shell movements of oysters, o.âoyster immobilize
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. EXPERIMENTAL STUDY OF THE OYSTER GILL 26 The oyster was immobilized b}' plaring it on a brick and embedding its left shell in a mixture made of 1 part of cement and 3 parts of plaster of Paris. A glass rod, attached bj' means of the same mixture to the right valve of the oyster, was connected to the lever of a recording apparatus (fig. 9) and the oyster was kept in a large aquav â¢/â¢iitv â rut --:!â r. Fig. 9.âMethod employed to study the shell movements of oysters, o.âoyster immobilized in plaster r.ârubber connections; «.âglass rods attached to the levers 0) of the recording apparatus; /,- time recorder; to.âweight of Paris; -Foxboro rium tank with running sea water. The records of the movement of the shells were made with a Foxboro or Bristol two-pen time recorder. The weight of the cement, glass rod, and lever was counterbalanced in such a way that the shell bore no addi- tional pressure. (Fig. 9.) In all the experiments the records of two oysters were taken simultaneously and the temperature of the water was recorded on the thernio-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States Fish Commission. Washington, The Commission, Govt. Print. Off
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