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This paper reports a series of experiments on the pulse-height response of CsI(Tl) crystals to monoenergetic gammas, protons, and alphas, in an effort to examine some predictions of a previously proposed model of the scintillation process. Analysis of the data to date indicates the following: The pulse height per unit energy for gammas is an energy-dependent function which reaches a maximum near 20 keyr, and the shape of this function is sensibly independent of Ti concentration. The pulse height per unit energy for protons and alphas is found to be energy dependent throughout the energy range studied. For alphas this function passes through a distinct minimum near 1 Mev. Effects dependent on pulse clipping time are discussed.