711 



We are, therefore, iinpresserl with the idea that the direction of 

 the coiidnctioii and the polarity of the ciliated cells are determined 

 siranltaiieously, and that conduction of the stimnlus is possible 

 only in a special direction. We are justified in assuming that this 

 phenomenon depends on the nature of the connection between the 

 ciliated cells. However, microscopical researches have not yet 

 produced positive evidence of this nature. 



