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PHYSIOLOGIOAL EFreots oF Lack oF OxyGEn 423 
must also lead to a standstill in the particular life-phenome- 
non under observation. We find that both possibilities are, 
indeed, encountered. Further investigation may possibly 
be able to show that the sudden cessation of life-phenomena 
through lack of oxygen may generally be attributable to 
structural changes. Were this the case, it might point the 
way, perhaps, to a clearer understanding of the action of 
many poisons. 
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