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This is the last of a series of investigations done by means of the vertical accelerator at Wesleyan University. 2 It was designed to discover how motion sickness rates are affected by wave frequency when the accelerations in the waves are held fixed. Using waves with a constant acceleration of 0.20 g, frequency was controlled by control of the duration of application of upward and downward accelerations. By this means wave frequencies of 13, 16, 22 and 32 cycles per min. were obtained, having amplitudes of 9 feet, 5 feet 4 in., 2 feet 6 in., and I foot i in. These frequencies are the same as were used in previous studies in this series, where time between accelerations, level of acceleration and other aspects of the waves were varied. Other significant variables were counterbalanced or controlled. The results on 120 Ss showed that sickness varied with the energy per wave; the biggest wave produced the most sickness, the smallest wave the least. The obtained sickness rates were 37, 37, 10 and 7 percent in going from the large slow wave to the small fast wave.

The present report is concerned with the reflex sensitivity to visual stimulation of the blind half of the retinal field in a case of hemianopsia after surgical resection of the left occipital lobe.t The