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When cells of Chlorella uulgnris absorb co|)per under anaerobic conditions, subsequent res|)iratioii, photosynthesis and growth of the cells are all severely inhibited. This does not occur when the metal is absorbed nnder aerobic conditions. When, after aerobic absorption of copper, the cells are exposed to a period of aiiaerohiosis, respiratory inhihition is as profound as when the nptake is anaerohic. In this case, however, respiration ninst eventually recover, for growth is not affected so severely as it is when cop|)er is taken up nnder unaerohic conditions. !t is concluded tliat the extra copper ahsorbed inider anaerobic conditions is directly or indirectly responsible for the greatly increased toxicity to growth, and that this copper is bound to sites not normally available imder aerobic conditions. Some aspects of the apparently nniqnc toxic effect of co|)per suggest that these extra sites are sulphydryl groups.

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