REPORT ON THE COMPOSITION OP OCEAN-WATER. 
65 
Thorpe and Rucker take as their standard the sea- water for which 0 S o = 1020, and 
give the values 0 S ( of this water for all integer temperatures from 0° to 36° in their 
Table XV. Column II. ; their values f(t) are entered in Column IV. of their table. For 
Challenger purposes it is more convenient to take as a standard the sea-water whose 
4 S 15 . 56 = 1026, which lies about mid-way between the occurring extremes, and it is better, in 
lieu of f{t), to give (p(t) ready calculated. The following Table V. is constructed on this plan. 
Table V . — Giving the Specific Gravities of “ Standard Sea- Water ” at t°. 
4 © 15-56 = 1026-00. 
I. 
t°. 
II. 
III. 
IY. 
V. 
Specific Gravity. 
Log. of 
Dittmar. 
Excess in Th. and 
R. 
Dittmar. 
Excess in Th. and R. 
in units of the fourth 
place. 
6 
1028-18 
+ •07 
0-0217 
+ 1 
1 
28-13 
+ •05 
•0201 
- 5 
2 
28-07 
+ •03 
■0185 
-10 
3 
27-99 
+ •03 
•0169 
-12 
4 
27-90 
+ •03 
•0154 
-14 
5 
27-79 
+ •03 
•0138 
-12 
6 
27-68 
+ •02 
•0124 
-15 
7 
27-55 
+ •01 
•0109 
-14 
8 
27-41 
+ •01 
•0095 
- 14 
9 
27-26 
■00 
•0081 
- 13 
10 
27-10 
■00 
■0068 
-13 
11 
26-92 
•00 
•0055 
- 9 
12 
26-74 
•00 
■0042 
-10 
13 
26-54 
•00 
•0030 
- 7 
14 
26-34 
•00 
•0018 
- * 
15 
26-13 
•00 
•0006 
- 2 
16 
25-90 
■00 
1-9995 
0 
17 
25-67 
■00 
•9984 
+ 2 
18 
25-42 
+ •02 
•9974 
+ 3 
19 
25-16 
+ •03 
•9964 
+ 4 
20 
24-90 
+ •03 
•9954 
+ 9 
21 
24-63 
+ •03 
■9945 
+ 9 
22 
24-36 
+ •04 
•9936 
+ 14 
23 
24-08 
+ •03 
•9928 
+ 12 
24 
23-80 
+ •02 
•9919 
+ 16 
25 
23-51 
+ ■01 
•9912 
+ 15 
26 
23-21 
+ •01 
■9904 
+ 17 
27 
22-90 
■00 
•9898 
+ 15 
28 
22-59 
-•01 
•9891 
+ 12 
29 
22-27 
-•02 
•9885 
+ 9 
30 
21-95 
-•04 
•9879 
+ 2 
31 
21-63 
-•06 
•9874 
- 9 
(PHYS. CHEM. CHALL. EXP. PART I. 1884.) 
