[en] The author has recently developed a novel method of measuring the intensity of light pulses, employing a photon counting technique, which permits accurate and successive measurements of variations in light pulse intensity, free from the changes in PMT gain. In the present work, an attempt is made to apply the method to measurement of the temperature dependence of scintillations in NaI(Tl) crystals. It is a unique feature of the present experiment that temperature coefficients of both 'scintillation' and 'scintillation + phosphorescence' can be simultaneously measured by the new method with reasonable accuracy. The scintillations are produced in an 1.5'' x 1.75'' NaI(Tl) crystal excited by Cs-137 gamma-rays (0.662 MeV). The crystal is optically coupled to a PMT through a lucite light guide so that the scintillations are introduced to the PMT with a reasonable high efficiency. Fiber optics is employed to transmit a small portion of scintillations from the NaI(Tl) crystal to a particular type of PMT kept at a constant temperature in another thermostatic chamber, and used to measure the variations in scintillation yield. The temperature coefficients of 'scintillations' and those of 'scintillation + phosphorescence' determined are presented. (N.K.)