Abstract
During the past year (1933-1934), much difficulty has been experienced in securing a good water supply for aquaria and for experimental purposes in laboratories of the department of zoology at the University of Illinois. Due to the excessive chlorine and ammonia treatment of the University water supply, fish and some invertebrates have died in large numbers. It is well known that hardy adult fishes are sensitive to over five-tenths of a part per million of chlorine. Our results show that some delicate species are even sensitive to a residual chlorine or chloramine as low as 0.05 of a part per million. Several experimental attempts to remove the chloramine were made, and it is the purpose of this paper to sketch briefly the results of these experiments.
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