In a prevous paper,1I made an analysis of ampullar stimulation and individual eye muscle response in rotary and in vertical nystagmus induced by rotation, which may be seen in figure 1. The usually accepted data for horizontal nystagmus are included. With the use of these data, figure 2 was prepared to show the details of the fourteen recognized types of nystagmus that can be induced by rotation. If it is admitted that rotation produces any movement in the endolymph, either current, slight shift or merely migration of heavier molecules or ions, then the positions and rotations that are used should affect the canals as indicated by the arrows. The muscles thus stimulated, according to my previous analysis, are the muscles needed to produce the clinical phenomena that are known to occur.