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Abstract
The method described previously for investigating the action of different addenda on the photosensitivity of silver bromide crystals has been used to study the effect of lead and iron ions on both stages of the photographic process. It is established that lead ions have a catalysing effect on the process of development and promote the latent image formation. Iron ions have an adverse effect on the two stages of the photographic process : although hindering the process of development, they have a strongly marked sensitizing effect on the latent image formation. The influence of iron ions on sensitized crystals has also been followed. The mechanism of the action of the addenda is discussed.