304 MORRIS LOEB 



attempts to obtain the reaction-coefficients, and to make 

 parallel experiments, with exactly the same time-intervals. If 

 the magnetic force had any effect, this must be visible from 

 the burette-readings. 



The method used was exactly as before, but diluted solu- 

 tions were employed to prevent the loss of free iodine. Equiv- 

 alent quantities of hydriodic acid and ferric chloride were 



allowed to react in molecular solutions, and 10 cc. were 



taken out at a time and titrated with - - "normal sodium 



115 



thiosulphate solution. The determinations were very exact, 

 and the corresponding burette-readings will be found to cor- 

 respond so closely as to leave no doubt of the exact equality 

 of speed within and without the magnetic field. I give all the 

 series which were observed; in the second set, the reaction was 

 carried as far as it would go, at least there was no more 

 iodine liberated after 15| hours' standing. 

 Temperature, 17.8. 



With Magnet (dynamo) 



Na 2 S 2 O 3 required 



3-95 



4-52 



5-10 



5-40 1 



5-58 



With Magnet (dynamo) 



Na 2 S 2 O 3 required 



5-92 

 6-93 

 7-38 

 7-90 

 8-04 



8-30 

 8-28 



