348 
Proceedings of the Royal Society 
Table I. — continued. 
Position, 
Tay Lightship. Lady Buoy. 
OffTayport. Off Dundee. 
Tide, 
If hr. flood 2 hrs. hd. 
2| hrs. hd. 5^ hrs.. hd. h. w. 
Surface ) 
density, f 
1-01991 1-01760 
1-01282 1-01734 1*01394 
Bottom ) 
density, J 
> 1-02381 (10 fm.) ... 
1-01457 
This indicates the increase of salinity from Inchkeith to off Elie, 
and then its increasingly rapid decrease to the mouth of the Firth 
of Forth, across St Andrews Bay, and up the Tay as far as Dundee. 
The tide being on the ebb to Crail, increases the apparent rate of 
freshening very slightly, while its flowing reduces it to a greater 
degree in the latter part of the journey. 
While returning from the Tay to Anstruther, the following series 
of observations was obtained (Table II.). The course was out of 
the river and eastward until about 7 miles beyond the Fairway 
Buoy ; S.W. until the North Carr Bock at the entrance to the 
Firth of Forth was sighted about 1^ mile off, then northwards near 
the shore until close on Abertay Sands, and finally southward, 
keeping about a mile off shore until arrival at Anstruther. All 
this area was freshened more or less by the Tay, taking as a standard 
of average salinity the usual state of the water between St Abb’s 
Head and the Isle of May. Off St Andrews the water was slightly 
salter at low, than at high tide, a fact which may be accounted for 
by the drying of the Abertay sandbanks, about half ebb, leading the 
brackish flow of the river further east than at high tide. 
Table II. 
Position, 
Tayport. Lady Buoy. 
Fairway Buoy 
7 miles E. of 
* Fairway. 
Tide, 
1| hr. hd. 2 hrs. 
hd. 2f hrs. hd. 
3 hrs. hd. 
4 hrs. hd. 
Surface 
density, 
1 1-02184 1-02325 1-02379 
1-02424 
1-02486 
Bottom 
density, 
} • 
1-02514 
1-02543 
Pncsifimi 
( 1J mile N.E. of 
Bet. N. Carr H mile ofl St S. 
end of Abertay 
\ N. Carr. 
and Kingsbarns. 
Andrews. 
Sands. 
Tide, 
5 hrs. hood. 
h. w. 
1 hr. ebb. 
If hr. ebb. 
Surface 
density, 
} 1-02491 
1-02468 
1-02490 
1-02468 
Bottom 
density, 
} 
1-02516 
1-02511 
Position, 
Off St Andrews. 
Off Kingsbarns. 
OffN. Carr. 
Off Anstruther. 
Tide, 
44 hrs. ebb. 
5| hrs. ebb. 
1. w. 
1 hr. hd. 
Surface 
density, 
} 1-02510 
1-02484 
1-02512 
1-02539 
