Abstract
AbstractThe advantage of plotting density versus time data on log instead of linear axes for studies of the mechanism of development is explained. When the data for low densities are corrected, if necessary, to silver mass and are plntted on log axes, a slope near 3 indicates that the rate of development varies as the effective surface area of the develnp<:d silver, whereas a slope near unity suggests that th e rate of development responds to the mass, or area of the silver halide. Data from the classic experiments of James, and Pontius and Willis are re-evaluated in this way. It is shown that there is no need ro invoke a special mechanism to account for the S-shape of the develnpment curve shown by some agents like hydroquinone. Slopes greater than 3 can be ascribed to a phase of very slow reaction prior to the onset of development with the rate constant that characterizes the phase of measurable density.
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