Methods for Determining Osmotic Pressures. 171 
Figures Obtained Using Two Solutions of Sodium Chloride 
Differing From Each Other by -01 of a Gram-Molecular 
Solution. 
G.-Mol. 
Strengths 
of Solutions 
(«) 
1st Reading. 
(b) 
2nd Reading. 
Lengths of Drops. 
1-59 & 1-58 
(<*) 
(b) 
Change 
78-0 65-0 555 84-4 48-5 
75-5 66-0 55-0 85-5 47-0 
1-44 & 145 
(«) 
(b) 
Change 
57- 9 55-4 6(5-0 74-3 74-5 
58- 3 54-9 66-8 74-0 75-1 
+ — + — -f 
1-43 & 1-44 
(a) 
(b) 
Change 
77- 5 93-4 71-0 84-4 80-7 
78- 8 92-3 71-1 83-3 82-2 
+ — + — + 
•2 & -19 
(«) 
(b) 
Change 
52-7 57-8 52-8 62-2 6L5 
51-9 58-5 52-1 63-0 60-8 
•19 & -18 
(a) 
(b) 
Change 
62-2 41-4 45-9 
61-5 42-2 44-9 
•18 & -17 
(a) 
(b) 
Change 
47-7 52-5 74-7 
46-6 53-5 73-3 
— + — 
•13 & -14 
(") 
(b) 
Change 
41- 3 44-3 41-5 32 5 46-7 
42- 0 41-1 41-8 32-3 47-2 
+ — + — + 
•12 & -13 
(«) 
(b) 
Change 
43- 4 55-1 53-7 
44- 3 54-3 55 1 
+ — + 
•12 & -11 
(«) 
(b) 
Change 
38-2 36-3 39-5 
37-7 36-9 39-3 
— + — 
•11 & 10 
(a) 
(b) 
Change 
57-5 49-8 54-0 
56-9 50-1 53-8 
— + — 
•08 & -07 
(<>) 
(b) 
Change 
278 33 0 42-3 46-1 34-7 
272 33-7 41-3 4C-8 34-1 
— + — + — 
This table shows the results obtained by balancing eleven pairs 
of solutions. The range of the concentrations is considerable, hut 
the members of each pair only differ by ‘01 gram-molecular solution. 
In each case the change that takes place shows quite definitely 
which of the two solutions is the stronger. On consideration of the 
figures it will be observed that the size of the drops does not vary 
