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Abstract
1. Water from an aquarium from which a host Evasterias troschelii has been removed 24 hours before no longer possesses an attraction for commensal Arctonoe fragilis. Similar results were obtained five hours after removal.2. Water from an aquarium from which a host Evasterias has been removed with difficulty, so that tube feet were torn from it, has no attraction for commensals almost immediately after removal of the host. Such water appears to repel them.3. Water from an aquarium from which a host Evasterias has been removed with comparative ease (involving less disturbance to the starfish) retains its attraction for commensals immediately after removal, but shortly thereafter the attraction appears to weaken.4. If a host Evasterias is suspended in a test aquarium in a dialyzing bag for two hours, at the end of this time not enough attractant has passed through to attract commensals.5. Experiments to determine whether attractant will diffuse through a dialyzing bag in effective concentrations overnight ma...
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