187 



and afterwards whilst air was drawn through they were 

 rotated on the clinostat. The extent of the curvature was 

 then always measured after 65 minutes, namely, the 

 reaction-time in air. Thèse measurements were made in 

 red hght, because I afterwards placed the objects again 

 for some time on the cUnostat in order to find out whether, 

 in those cases, in which the reaction after 65 minutes 

 was weaker than it would hâve been in ordinary air, 

 there might possibly be an increase again afterwards. This 

 possibihty was in no case reaHsed, so that. by perception 

 in nitrogen no lengthening of the reaction-time was caused. 



TABLE 13. 



Strength of stimulus 900 m. g. -secs. Température 20° C. 



Reaction-time 65 minutes. 



