1. The glucose uptake rate by Eurytrema pancreaticum was a mean value of 16.44 ± 2.42 µM/hr/g, and total CO₂ production rate by the fluke averaged 5.82 ± 0.97 µM/hr/g. The relative specific activity of respiratory CO₂ showed a mean value of 5.75 ± 0.84 per cent. The rate of CO₂ production derived from medium C¹⁴-glucose was a mean of 0.33 ± 0.10 µM/hr/g. Therefore, the average value of 0.32 ± 0.04 per cent of glucose utilized by the flukes from the medium C¹⁴-glucose was oxidized to respiratory CO₂.

2. The tissue concentration of glycogen in E. pancreaticum was a mean of 45.50 ± 2.18 mg/g or 4.55 ± 0.22 %/g. But the turnover rate of glycogen pool was a mean of 0.027 ± 0.003 %/hr or 0.009 ± 0.002 mg/hr/g. The average value of 0.64 ± 0.23 percent of glucose utilized by the flukes from the medium C¹⁴-glucose was incorporated into the glycogen.

3. These data account for that only 1 per cent of the utilized glucose by the flukes participated in furnishing the oxidation into respiratory CO₂ and the synthetic process into glycogen.