“…In vitro insulin (2 lU/ml) caused Ex-mouse increased oxygen uptake of adults and cercariae Cornford, 1971 specific for male worms. Reports on the differential effects of testosterone and gonadectomy on male and female schistosomes are not uncommon (Berg, 1953(Berg, , 1957a(Berg, , 1957bRobinson, 1959aRobinson, , 1959b , 1966cKrupa et al, 1967). In contrast, studies with platyhelmlnths suggest that the hyperthyroid condition is characterized by accelerated egg production, and the establishment of larger numbers of worms (Larsh, 1947(Larsh, , 1950Landt, 1955;Abdel Wahab et al, 1971).…”