798 
Proceedings of the Boyal Society 
Curves show variation of density with phase of tide 
(a) at surface, 
(&) at bottom. 
So far as interpretable, these curves accord with those of 
temperature in fig. 1. 
Fig. 3. Kincardine, 27th April 1886, between hours of 10.45 and 
15.40. 
Curves showing variation of temperature with depth at the 
following instants : — 
(a) 10.45 o’clock, or hours ebb. 
(b) 11.45 o’clock, or 3J hours ebb. 
(c) 13.15 o’clock, or 4f hours ebb. 
(d) 15.40 o’clock, or 1 hour flood. 
( a ), (5), (c) are similar in form, and probably indicate transla- 
tion of water en masse. 
In (ft) the shearing motion above referred is clearly suggested 
by the back-throw of the bottom of the curve. 
Fig. 4. Alloa, 29th April 1886. Variation of temperature with 
depth at high water. Form of curve is supposed to be 
typical of both high and low water. 
Fig. 5. Kincardine, 1st May 1886, between 7.10 and 9.50 o’clock. 
Dotted curves show variation of salinity with depth ; plain 
curves show variation of temperature with depth at 
(a) low water. 
(b) lh. 20m. flood. 
( c ) 2h. 20m. flood. 
(d) 2h. 40m. flood. 
Note the great similarity between the two sets. 
Fig. 6. Alloa, 28th April 1886, between 12 and 15.10 o’clock. 
Dotted curves show variation of salinity with depth, plain 
curves of temperature with depth at 
