“…They found 0*522 per cent, in the rabbit, 0^45 per cent, in the cat, 0-39 per cent, in man, 0-37 per cent, in the dog. Other recent observations are in close agreement with these determinations ; thus in rabbit's muscle Riesser [1913 Creatine is most abundant in voluntary muscle (Cabella [1913], Beker [1913]) ; there is less in cardiac and least in involuntary muscle.…”