Stimulation of the Labyrinth of the Ear. 



81 



cone, hemoglobin 



= const., 



cone, oxyhemoglobin 

 which is a uniform result at constant pressure and temperature, 

 obtained by four different methods. It is necessary in closing 

 to call attention to the fact that in all experiments the gas pres- 

 sures were relatively high and that under these conditions one is 

 working in the neighborhood of maximum saturation of hemo- 

 globin with CO or oxygen. 



53 (749) 



The effects of stimulation of the labyrinth of the ear in the living 

 animal. (With demonstration.) 



By J. Gordon Wilson and F. H. Pike. 



It may be shown that if one sits in a moving railway train 

 and observes objects out of the window, they may seem to be 

 moving in a direction opposite to that of the train. If one notices 

 the movements of one's eyes in observing these objects, it will 

 be seen that the eyes move slowly backward, opposite to the 

 direction in which the train is going, and more quickly return to 

 the median position, the quick movement of the eye being in the 

 same direction as the movement of the train. We may express 

 this relation between eye-movements and apparent movement of 

 external objects or real passive movement of the one's own body 

 by the statement that the apparent movement of external objects 

 is in the direction of the slow deviation of the eyes, and the real 

 passive movement of one's body is in the direction of the quick 

 movement of the eyes. The otic labyrinth is not involved in 

 these reactions. We may extend this relationship still further 

 and say that under whatever conditions of this kind, with one 

 possible exception, 1 one may be placed the movement, either real 

 or apparent, of external objects is in the direction of the slow 

 deviation of the eyes, and passive movement, either real or ap- 

 parent, of one's own body is in the direction of the quick movement 

 of the eyes. While many of the facts have long been known, we 

 have not seen any general expression of the relationships in terms 

 of the slow and quick eye movements. 



1 Holt, E. B.. Psychological Review, 1909, XVI, p. 388. 



