TASTE AND SMELL 109 



smelt. (When the minimal strength of solution is thus 

 approximately determined A and B should change roles, 

 to allow an interval before the final determination.) 

 Then B takes water and the apparently minimal solu- 

 tion, and offers them to A five times each in indeter- 

 minate order. If A is right four times out of five with 

 each fluid, test similarly with the next weakest solution. 



