Abstract
1. Studies have been made of carbohydrate metabolism inFasciola giganticaduring starvation and these are compared with data available about carbohydrate metabolism inF. hepatica.2. InF. giganticathe glycogen content before starvation was 5·4% of f.w. or 25·35% of D.W. of tissue, and the glycogen content after starvation was 3·5% of F.W. or 16·29% of D.W. of tissue.3. The medium in whichF. giganticawas incubated was analysed for lactic acid as one of the end products of glycogen consumption. The lactic acid given out in a period of 2 hr. was 0·46% of F.W. or 2·18% of D.W. of tissue.I wish to thank Professor K. Sahai for his generous help in the preparation of this manuscript.

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