420 



Lord Blythswood and Dr. E W. Marchant. 



Weight (in grams) of 

 anhydrous salt in 

 100 c.c. of normal 

 solution. 



Thickness (in mm.) of 

 normal solution neces- 

 sary to produce the 

 same absorption as 

 20 mm. of water. 



Acetates : — 



Aluminium (powder).., 



Iron (powder) 



Calcium . . A 



Potassium. 



Barium 



Copper 



Lead 



Nitrates : — 



Aluminium 



Magnesium 



Calcium ...» 



Potassium 



Cobalt 



Nickel 



Zinc 



Copper 



Barium 



Strontium* 



Cadmium 



Lead 



Uranium 



Sulphates : — 



Aluminium 



Magnesium 



Sodium 



Ammonium 



Cobalt 



Iron (Ferrous) 



Copper 



Nickel 



Zinc 



Cadmium 



Carbonates :— 



Ammonium 



Sodium 



Bichromates : — 



Ammonium 



Potassium (saturated 



solution) 



Potassium chromate 



6-8 

 8'7 

 7 9 

 9'8 



12-7 

 9-0 



16 -2 



7- 1 



7'4 



8- 2 

 10-1 



9- 1 

 9*1 

 9-4 

 9'3 



13- 

 10-6 

 11 -8 

 16 -5 



14- 2 



5- 7 



6- 



7- 1 



6- 6 



7- 7 

 7-6 

 7*9 

 7-7 

 8*0 



10 '4 



4-8 

 5'3 



12 -6 



9-7 



16 -0 

 10-9 

 10-8 

 9-4 

 8'2 

 7-0 

 2-0 



17 -0 

 15-2 

 124 

 10 -8 

 10 6 

 8-3 

 7 5 

 7-3 

 6 7 

 5-8 

 5 



•5 

 3 1 

 1-9 



16-0 

 15-2 

 13-5 

 13-0 

 8-9 

 8:0 

 7-1 

 7-0 

 6-8 

 4-6 



18 

 18 -2 



7 3 



8*3 



7-8. 



Now proceeding to a consideration of the results obtained, it is at 

 once clear that the absorption, in almost every case, in these normal 

 solutions, increases with the atomic weight, i.e., the higher the atomic 



* This salt contained a good deal of impurity, and the value given is therefore 

 doubtful. 



