466 
Proceedings of the Boy al Society 
Bottom density observed at the following hours, that at 15 h .30 
being the same for mid-stream and near each bank. 
Hour, . 
. 14 h .50 
14 h .57 15 h .5 
15 h .18 
15 h .20 15 h .30 
m .35 
Bottom density (rough), . 1*001 
1*001 1*002 
1*003 
1*002 1*004 
1*018 
At 15 h .55. 
Depth, . . 
Surf. 1 ft. 
1ft. 3. 1ft. 6. 2 ft. 
3 ft. 
4 ft. 5 ft. 6 ft. 
7 ft. 
Density (rough), 
1*0015 1*001 
1*001 
1*005 
1*019 1*022 
Density at 15°*56 C. . 
0*99917 ... 
1*00600 
... 1*01810 ... 
At 16 h .10. 
Density (rough), 
1*001 1*001 
1*002 1*008 1*008 
1*014 
1*019 1*017 1*022 
At 16 h *55. 
Density (rough), . 1 001 1*002 1*004 1*014 1*016 1*023 1*022 1*023 
Density at 15°*56 C. 0*99944 1*02041 1*02258 
These data are used in constructing the curves on Plate XIII. 
fig. 2, and the coloured diagram Plate XIV. fig. 2. 
IV. Flowing Tide . — August 11, observations from 10 h .40 to 
ll h .40; high water 13 h .7. Very strong wind blowing down the 
river. Temperature at surface 57° *5. The high wind made it 
impossible to read the hydrometer with great accuracy. 
At 10M0. Depth, . . Surf. 1 ft. 2 ft. 3 ft. 4 ft. 5 ft. 6 ft. 7 ft. 8 ft. 9 ft. 
Density (rough) 1*026 1*025 1*0265 1*0265 ... 1*027 1*028 
Surf. 3 in. 6 in. 9 in. 1 ft. 1 ft. 3’.- 1 ft. 6. 1 f t. 9. 2 ft. 3 ft. 4 ft. 9 ft. hot. 
Atm. 7, 1*004 1*004 1*006 1*014 1*022 1*024 1*024 ... 1*0255 1*026 
At m .20, 1*004 1*006 1*007 1*011 1*0145 1*017 1*017 1*022 1*024 1*025 
At 12\0 1*001 1*004 1*013 
These figures are represented by curves in Plate XIII. fig. 3, and 
by colours in Plate XIV. fig. 3. 
IVa. High Water and Ebb Tide . — In the backwater near its 
entrance, where we were driven by the gale, the wind that was 
blowing down the river was blowing up (see the arrows in fig. 1, 
p. 463). There the following observations were made : — 
Surf. 
1 ft. 
2 ft. 
2 ft. 3. 
2 ft. 6. 
2 ft. 9. 
3 ft. 
3 ft. 3. 
3 ft. 6. 
3 ft. 9. 
4 ft. 
5 ft. 6. hot. 
From 12 h .25 
, 1*003 
1*004 
1*005 
1*005 
1*004 
1*004 
1*013 
1*025 
tom. 40, 
r ••* 
1*005 
1*016 
1*021 
1*023 
At 13 h .25, 
1*000 
1*002 
1*0025 
1*003 
1*011 
1*014 
At 13 h .35, 
1*004 
1*004 
1*005 
1*005 
This shows how the salinity increased until close upon high water, 
and how it then suddenly vanished. The curves of density are 
given in Plate XIII. fig. 4, and the diagram of salinity in Plate 
XIV. fig. 4. 
V. Ebbing Tide . — August 7, observations at 12 h .15; high- 
