The lithdevelopment effects are studied by using multicoated emulsions. In higher exposure level, quinone, the oxidation product of development, contributes to the acceleration effect. On the other hand in lower exposure level neither the acceleration effect by quinone nor its latent image bleach is observed. It is suggested that the pH depression by development contributes to the retardation effect. The acceleration effect by quinon works only in near vicinity of the development site while the retardation effect by the pH depression reaches to relatively longer distance. The bromide ions liberated by development show little development effect.