450 



Dr. J. J. Hood on Retardation 

 Blank. 10° C. 



Permanganate, 



Time, 

 minutes. 



Time, 

 calculated. 



1031 







... 



7-88 



213 



20*9 



6-45 



384 



... 



472 



693 



68-6 



308 



1156 



1150 



211 



162-1 



1601 



1-58 



1984 



196-5 



1-10 



247-0 



2440 



In a similar manner the values for / and g when 1 gram 

 MgS0 4 was added, the total volume being the same as before, 

 are found to be respectively 131*9 and 88*3. 



1 gram MgS0 4 . Temp. 10° C. 



Permanganate, 



y- 



Time, 

 minutes. 



Time, 

 calculated. 



10-33 







... 



8-16 



210 



211 



6-60 



41-8 



... 



5-30 



65-2 



65-5 



3-54 



114-3 



1140 



2-55 



1560 



157*3 



1-98 



1910 



192-6 



1-40 



2410 



243-3 



With 5 grams MgS0 4 the values found are /=201'3 and 

 <7 = 134-(J. 5 grms MgS0 4 . Temp. 10° C. 



Permanganate, 



y- 



Time, 

 minutes. 



Time, 

 calculated. 



10-34 









819 



311 



314 



760 



42-3 



... 



6-51 



65-7 



661 



4-91 



1130 



113-4 



3-81 



1581 



159-9 



316 



194-4 



196-4 



2-50 



245-2 



244-3 



