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A series of lactose granulations made with various amounts of starch paste and water was subjected to milling through different screens and the particle sizes were determined. The distributions were log-normal when the size of the coarse material was determined by sieve analysis and the size of the fine material was determined microscopically. An equation was developed to describe the increase in surface area, ΔO, when material is milled through a screen with nholes of diameter d; this equation takes the form: log[n(ΔO)] =-q(log d) + p, where qand pare constants.