Mr. J. J. Hood on the Laws of Chemical Change. 381 

 and not the first for a, on account of its being faulty, we get 



.-25-6 = 2275-71o gl0 {(-f ;F8 )(U)}. 

 Temperature 17°'8 C. n='8. 



Permanganate, in 

 cubic centims. 



Time, in minutes. 



Found. 



Found. 



Calculated. 



917 

 838 

 777 

 7-20 

 6-68 

 6-30 

 5-96 

 5-70 

 5-26 

 4-95 

 4-64 

 4-48 

 4-26 

 3-98 

 3-88 

 3-57 





 25-6 

 48-3 

 74-6 



102-8 



126-8 



151 



173 



216-5 



248-5 



292 



315-5 



345 



401-5 



438 



508 



13 



73-5 

 101-1 

 124-8 

 1491 

 1701 

 2116 

 2468 

 288 

 312-2 

 3492 

 406-4 

 429-5 

 513-6 



The criterion of areas applied to those experiments gives 

 very close results. The approximately true areas are given by 

 the formula 



£( H ){tn+l — t n ); 



and the real areas are found by assuming the curve to be 



which gives for the area between the curve and axes, taking 

 the limits for y of first and last experiment, 



area=5C'lo gl0 (|±|) 



using the constants found by experiment. 



Areas. 





Theory. Found. 



Percentage 

 d inference. 





1230-4 1229-6 

 823-4 819 

 1725 1744 

 2716 2716-2 



•53 

 1 11 









5 







