Glucose induced respiration can be selectively inhibited by cycloheximide and streptomycin. The optimal quantities used in the three soils were 8～12 mg/g soil for cycloheximide and 4～8 mg/g soil for streptomycin. The incubation time following glucose addition was less than 4 hours. The total inhibition was about 50% of glucose induced respiration. The bacterial and fungal ratios for soil samples No. 1 and No.2 were comparable with these measured by agar film direct microscopy. It failed in determining th...