224 
Proceedings of the Royal Society of Edinburgh. [Sess. 
Table YI. — Continued. 
No. of Water. 
Aw by 
the 
pykno- 
meter. 
A 18 by 
the den- 
simeter. 
Differ- 
ences. 
Grams 
of Cl 
per 
litre. 
Time. 
Temp. 
Position of Ship. 
57. 
1*02770 
1-02769 
00001 
20-608 
/ Noon 
68° 
58. 
69 
772 
+ 
3 
•580 
| 
' 12.15 
p.m. 
68° 
59. 
69 
774 
+ 
5 
•580 
12.30 
M 
68° 
60. 
66 
769 
+ 
3 
•580 
12.45 
II 
68° 
61. 
70 
775 
+ 
5 
•580 
1.0 
II 
68° 
62. 
73 
770 
- 
3 
•651 
1.15 
II 
68° 
63. 
97 
794 
- 
3 
•792 
! 1.30 
II 
68° 
64. 
68 
769 
+ 
1 
•615 
1 1.45 
l| 
69° 
65. 
98 
792 
- 
6 
•825 
. 
I 2.0 
II 
69° 
66. 
97 
802 
+ 
5 
•825 
2.15 
II 
70° 
67. 
1-02802 
797 
— 
5 
•825 
2 
1 2.30 
II 
70° 
68. 
06 
803 
- 
3 
•862 
+3 i 
2.45 
II 
70° 
/ 36° 20' N. lat. 
69. 
02 
795 
- 
7 
•825 
3.0 
II 
71° 
\ 7° 5' W. long. 
70. 
06 
797 
- 
9 
•862 
4.0 
1 1 
72° 
71. 
07 
801 
- 
6 
•862 
5.0 
II 
71° 
72. 
1-02792 
793 
+ 
1 
•756 
6.0 
II 
68° 
73. 
80 
772 
— 
8 
•668 
7.0 
II 
66° 
74. 
93 
787 
- 
6 
•756 
8.0 
II 
66° 
75. 
67 
761 
- 
6 
•545 
9.0 
II 
62° 
/ 3 miles S. of Sagres (C. St. 
76. 
48 
747 
- 
1 
•439 
10.0 
II 
59° 
\ Vincent). 
77. 
53 
750 
- 
3 
•545 
11.0 
II 
60° 
78. 
54 
750 
- 
4 
•456 
' Midnight 
62° 
79. 
60 
760 
± 
0 
•545 
/ 1.0 
a.m. 
63° 
80. 
54 
751 
- 
3 
•474 
2.0 
ii 
62° 
81. 
58 
753 
- 
5 
•509 
3.0 
ii 
62° 
82. 
47 
738 
- 
9 
•439 
4.0 
it 
59° 
83. 
55 
749 
- 
6 
•474 
4-3 
5.0 
ii 
58° 
84. 
57 
755 
- 
2 
•509 
o 
O , 
) 6.0 
ii 
61° 
85. 
43 
732 
- 
11 
•403 
N 
7.0 
ii 
59° 
86. 
44 
734 
— 
10 
•439 
8.0 
ii 
60° 
87. 
48 
741 
- 
7 
•439 
9.0 
ii 
62° 
88. 
52 
749 
— 
3 
•474 
10.0 
ii 
62° 
89. 
1*02807 
798 
_ 
9 
•862 
11.0 
ii 
63° 
90. 
1-02742 
729 
— 
13 
•403 
' Noon 
62° 
On the Effect of Variations in Temperature. 
(a) Normal Ocean Waters. 
We have now to consider an important point, namely, the effect of 
variations in the temperature of the two waters in the densimeter upon 
their relative density. 
To maintain tubes of more than 1 metre in length at some standard 
temperature is a matter of no little difficulty, and probably on account of 
this, Hare’s apparatus has not been used more extensively. When, how- 
