349 
of Edinburgh, Session 1884-85. 
These observations, while insufficient to trace out the form of the 
brackish area beyond the mouth of the Firth of Tay, show that St 
Andrews Bay is affected with the fresher water, and that the Firth 
of Forth to a few miles west of the May Island is also slightly 
freshened. Both these effects must be subject to variations from 
the direction of the wind and the amount of flood in the river. 
Until further examination is made, speculation on the subject of 
the general variation of salinity along the coast had better be post- 
poned ; but it is certain that if such work could be carried out 
valuable results would be obtained. 
The following are the densities of the water samples collected in 
the estuary of the Tay (Table III.) : — 
Table III. 
Position, 
Perth 
Newburgh. 
Date, . 
. May 27 
May 26 May 26 
Tide, . 
h. w. 
h. w, 
1. w 
Depth, 
2 fm. 
2 fm. 
Surface density, 
0-99931 0-99910 
Bottom density, 
. 0-99920 
0-99934 
(Bet. Birkhall 
Position, . 
The Kirk (5 miles below Newburgh. 
•< Bank and 
( Tay Bridge. 
Date, 
May 26 May 26 June 3 June 3 
June 3 
Tide, . 
. 2J hrs. ebb. l^hr. fld. 3J hrs. fid. h. w. 
2 hours fid. 
Depth, . 
3 fm. 5 fm. 3J fm. 
4| fm. 
Surface density, 
. 1-00491 0-99910 1-00140 1-00286 
1-00395 
Bottom density, 
1-00807 0-99940 1-00122 
1-00492 
Position, . 
Off Dundee. 
Date, . 
May 26 May 26 June 2 
June 3 
June 3 June 3 
Tide, . . . 
4 hrs. ebb. 1. w. h. w. 
4J hrs. ebb. 
li hr. fid. 1 hr. ebb. 
Depth, 
3 fm. 
4 fm. 
Surface density, 
1-00874 1-00413 1-01394 
1-01358 
1-00909 1-01500 
Bottom density. 
1-00413 1-01457 
Position, 
Off Tayport. 
Date, 
June 2 June 2 
June 3 
June 3 June 4 
Tide, . 
. 2ijj hrs. fid. 5 % hrs. fid. 
5 hrs. ebb. 
1 hr. fid. 1| hr. fid. 
Depth, . 
9 fm. 
Surface density, 
. . 1-01282 1-01734 
1-01459 
1-01813 1-02184 
Bottom density, 
Position, 
Abertay Lightship. 
Date, . 
June 2 
June 3 
June 4 
Tide, . 
. If hr. fid. 
1. w. 
2f hrs. fid. 
Depth, 
9 fm. 
6 fm. 
10 fm. 
Surface density, 
. 1-01991 
1-01919 
1-02379 
Bottom density, 
. 1-02381 
1-02183 
1-02514 
