530 THE AMERICAN NATURALIST [Vol. LIV 



TABLE II 



nystagmus under usual conditions, this upright posture 

 induced some after-nystagmus; but it is important to note 

 that the time and the intensity of it were never so great 

 (by more than half) as the original nystagmus in these 

 positions. That is, there seems to be a "transfer" effect 

 from one set of conditions to another. Changing the 

 speed or the number of rotations at any time produced a 

 similar reappearance of nystagmus, but never in its orig- 

 inal intensity or temporal duration. Several of the sub- 

 jects gave a nystagmus varying between twelve and 

 twenty-five seconds when rotated once a second for thirty 

 seconds before the practise series. After the practise 

 series, these values were reduced to about the level of the 

 original values for the rotation-rate used in the investi- 

 gation, viz., 5-6 seconds. The change of position of the 

 rat during and after rotation had to be carefully re- 

 garded; for such a change was frequently responsible 

 for an increase of nystagmus-tinie that obscured a real 

 decrease. 



There are several special points of importance. 

 1. It has been noted above that subjects "G" and M H" 

 offer certain exceptions to our conclusions. Table I indi- 



