256 Proceedings of Royal Society of Edinburgh. [june 6, 
relations will be made more apparent by the graphic treatment 
adopted in PI. VIII. fig. 2. The density given is that by a small 
hydrometer, and is not corrected for temperature, except in the 
case of the observation on the 6th, at 15 h 45. The force of the 
wind is expressed in degrees of Beaufort’s scale. The weather 
throughout this set of observations was clear and dry. 
Table IV . — Observations in Kessock Roads , off Clachnaharry. 
Date. 
Hour. 
Wind. 
Tide. 
Depth. 
Temperature. 
Density. 
Air. 
Surface. 
Bottom. 
Surface. 
Bottom. 
Aug. 6 
15.45 
WSW.,5 
q h. fid. 
fm. 
6 * 
o 
56-0 
55-9 
1-02028 
1-02041 
5’ 
17.10 
W., 4 
H. W. 
6* 
67-0 
57-3 
55-9 
1-0202 
1-0200 
55 
18.5 
... 
1 h. eb. 
62-5 
57 T 
56 T 
1 -0198 
1-0210 
55 
19.10 
W., 2 
2 „ 
60-4 
57-0 
56-7 
1-0190 
1-0195 
55 
20.10 
W., 2 
3 „ 
6 
58-0 
57-3 
56-4 
1-0190 
1-0195 
55 
21.10 
W., 1 
4 „ 
°2 
... 
57-0 
56-8 
1-0190 
1-0195 
55 
22.0 
0 
5 „ 
5 
58-0 
57-4 
56-3 
1-0177 
1 -0185 
55 
23.0 
... 
6 „ 
4§ 
57-5 
561 
1-0178 
1-0190 
Aug. 7 
0.0 
... 
| h. fid. 
5 
58 T 
57-3 
56-4 
1-0180 
1-0190 
5 5 
1.0 
... 
2 „ 
... 
57-2 
56-2 
1-0180 
1-0200 
55 
5.30 
... 
H. W. 
64 
... 
... 
1-0215 
1-0210 
This corresponds with results previously obtained at Kincardine, 
and shows most of the features more prominently brought out by 
observations in the firths of Cromarty and Dornoch. 
Cromarty Firth . — The straight coast line running south-west- 
ward from Tarbat Kess, and bordered by a band of water under 
10 fathoms in depth, is broken by the abrupt hills which define 
the entrance to the Cromarty Firth. Between them there is a 
depth of over 25 fathoms; and a clearly “cut channel, with steeply 
sloping sides, and more than 10 fathoms deep, runs straight west 
through the wide shallows on either side to Alness Point, 10 miles 
from the Sutors. The depth diminishes rapidly above Alness, and 
the channel is much choked by sandbanks. Strong tidal streams 
