516 



Prof. J. 



G. MacGregor and Mr. E. H. Archibald on 



$K 2 S0 4 . 



$CuS0 4 . 



*z 



nS0 4 . 



*Na 2 S0 4 . 





Molecular 





Molecular 





Molecular 





Molecular 



Dilution. 



Conduc- 



Dilution. 



Conduc- 



Dilution. 



Conduc- 



Dilution. 



Conduc- 



4000 



tivity. 





tivity. 





tivity. 





tivity. 



1173 



4000 



852 



100-0 



684 



20 



784 



3333 



1166 



3333 



832 



80-0 



665 







2857 



1158 



285-7 



812 



15-62 



771 



2500 



1152 



2500 



795 



66-66 



647 







222-2 



1146 



222-2 



778 



5000 



610 



1250 



753 



200-0 



1140 



2000 



763 







181-8 



1134 



181-8 



749 



4000 



582 



1000 



734 



1666 



1130 



166-6 



738 



33 33 



555 







150 



1124 



150-0 



726 



7-047 



663 



133-3 



1116 



133-3 



713 



2500 



520 







1250 



1112 



125-0 



704 



22-22 



508 



5-882 



651 



110-1 



1104 



110-1 



687 







1000 



1097 



1000 



676 



20-00 



500 



5-313 



648 



800 

 6000 



1083 

 1062 



80-0 

 6000 



651 

 616 



16-66 



484-0 



3-692 



623 



5000 



1046 



50-00 



5920 



13-33 



463-0 







45-00 

 35-71 



1037 

 1015 



4500 

 35-71 



579 

 545-5 



12-50 



455 



2918 



598 



30-00 



997 



3000 



522-5 



1000 



4304 



2-431 



583 



25-00 



978 



25-00 



497-0 



8-00 



414-0 







2000 



960 



2000 



479-6 



2022 



562 



1666 



945 



1666 



465-8 



6-666 



400-0 







1500 

 13-33 



936 

 925 



1500 

 1333 



457 5 



447-0 



5-000 



375-0 



1-689 



541 



12-50 



918 



12-50 



441-8 



4000 



354-5 



1-408 



521 



1101 

 1000 



905 



895 



1101 

 10-00 



431-7 

 423-5 



3-333 



3410 



1-176 



496 



8-00 



872 



8-00 



403-2 



2-500 



3170 







6000 

 5-000 



840 

 824 



6000 

 5000 



378-1 

 359-5 



2-222 



3090 



1-016 



478 



4-500 



815 



4-500 



349-9 



2000 



302-0 



0-847 



456 



3-571 



792 



3-571 



3290 



1-666 



290-5 







3000 



775 



3-000 



3180 









2500 



756 



2500 



304-5 



1-333 



270-6 







2-000 



736 



2000 



288 2 



1176 



260-8 







1-500 



709 



1-500 



268-3 







1-333 



698 



1-333 



261-3 



1-000 



2485 







1-101 



679 



1-101 



249-8 











1000 



672 



1-000 



242-1 











•806 



650 



•651 



209-8 











•773 



647 



•521 



1920 











The following table contains (1) the observed values of the 

 conductivity of a series of solutions of the double salt ; (2) the 

 observed values of the conductivity of equivalent mixtures of 

 simple solutions of potassium and copper sulphates, i. e. of 

 mixtures having the same composition as the solutions of 

 double salt, these observations having been made to ascertain 

 whether or not such mixtures were identical, with respect to 



