Abstract
Lactic acid is produced in the muscles of several species of fish examined and of lobsters under conditions in which it is known to be produced in other animals already studied. The quantity present is less than in the skeletal muscles of the land-living vertebrates. The highest concentration found (in haddock) is comparable to that found in mammalian heart muscle; the lowest (in hake) is comparable to that found in reptilian smooth muscle. There is a remarkable difference between these two fish of the same family ; greater than any difference observed between the skeletal muscles of land-living vertebrates.

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