─────────────┬──────────────────┬──────────────── C.cs. of │ Molar │ Maximum 0·3 Molar │ Concentration of │ Rate of Arsenate │ Arsenate. │ Fermentation. in 40 c.c. │ │ ─────────────┴──────────────────┴──────────────── 0 0 3·5 0·005 0·0000375 6·3 0·01 0·000075 8 0·02 0·00015 14·2 0·04 0·0003 19·9 0·1 0·00075 29·7 0·2 0·0015 35 ───────────────────────────────────────────────── 0·5 0·00375 34·9 1·0 0·0075 29·5 2·0 0·015 23·2 5·0 0·0375 14·5 10·0 0·075 8·7 15·0 0·1125 5·3 20 0·15 3·2 ───────────────────────────────────────────────── The contrast between glucose and fructose in their relations to [p077] arsenate are well exhibited in the following table, in which the rates of fermentation produced by arsenate in presence of excess of glucose and fructose respectively are given:-- ──────────────────────────────────────────────────── Rate. Concentration of Arsenate. ─────────────────────── Glucose. Fructose. ──────────────────────────────────────────────────── 0·0075 molar 12·1 26·6 0·0225 (opt. for glucose) 13·4 -- 0·0525 (opt. for fructose) -- 45·8 0·1125 5·1 39 ──────────────────────────────────────────────────── Here the optimum concentration for fructose is more than twice that for glucose, whilst the maximum rate of fermentation obtainable with fructose is between three and four times the maximum given by glucose. V. EFFECT OF ARSENITES ON THE FERMENTATION PRODUCED BY YEAST-JUICE.