Variations of deoxyribonuclease and protease activities were investigated at varying intervals after infecting virus. It was demonstrated that the activation of protease is relatively small within 2 or 3 days after infection and becomes much higher in 4 or 5 days. Deoxyribonuclease, however, is activated only in the latter half of virosis development. The action of these enzymes i n worms was further measured a few hours after treating with inducers and virus. It was established that the activity of protease as well as deoxyribonuclease is augmented by the injection of hydroxylamine, hydrogen peroxide, potassium nitrite, acetoxime, sodium carbonate and polyhedra.