474 
Proceedings of the Royal Society 
The temperature steadily rose from 57 '3 until at the point where 
the density was T021 it was 57°*8; it then fell gradually to 57°*1 
at the point where the density was 1*025, about 1J mile off-shore. 
Xc. From that position we steered SE. by E. straight for Port 
Gordon until about 1 mile from the harbour. The temperature rose 
steadily from 57*1 to 58*2, and the density varied as follows : — 
1-026, 1*0265, 1-026, T0255, 1-025, 1-025, 1-0245, 
1-024, 1-024, 1-023, 1-023, 1-022, 1-022, 1-021, 
1-020, 1-0205, 1-0215, 1-022, 1-025, 1-024. 
The approximate distribution of salinity is shown in PI. XV. fig. 2. 
XI. On August 26, at 8 h .15, by the kindness of Captain Link- 
later of the “St Clair,” a sample of surface water was taken in the 
centre of the Moray Firth between Aberdeen and Wick. The 
weather was bright, with an easterly swell. The temperature of the 
water was 52°*7, and the density, afterwards determined, as 1*02612. 
Another sample was taken on September 18, at 10 h .30 when off 
Stonehaven, about 2 miles from shore ; the weather was bright and 
clear, the sea calm, air temperature 5 5° *4, and that of surface water 
54°*5. The density was found to be 1*02592. 
Salinity of the Sea Margin. 
Observations were made on several occasions along the shore at 
regular intervals. The density was observed by means of the small 
hydrometer, the samples of water being collected in the surf by 
wading as far out as circumstances would permit. 
XIIu. On August 15 the river, which had been in high flood on 
the 1 3th and 1 4th, had subsided considerably, but was still flooded. 
A swell coming in, caused a heavy surf. Samples were taken every 
\ mile from a position 1J mile east of the river mouth, westwards 
to the river; time, from 10 h .45 to 12 h .20. High water, 16 h .27. 
1-026(58° -0), — (58°-0), — (56°-5), l-021(56°-2), l-021(56°-0), — (56°3). 
Xllb. August 16. From 15 h .30 to 16 h .25 (high water) the fol- 
lowing observations were made at the same places : — 
l-026(56°-9), l-0245(57°-2), l-024(57°-6), l-021(58°-0), l-0245(57°-2), — (— ). 
Xllla. August 17. From Port Gordon, 2J miles east, to mouth 
of Spey. High water, 17 h .20. Observations every J mile. 
From 1J miles east of Spey to Port Gordon, 1 l h . 35 to 12 h .20. 
l-020(56°-7), 1-023(56° 2), l-0225(57°-0), 1026(59°-3). 
