of Edinburgh, Session 1884-85. 45 
determined were given, it is impossible to compare them with others 
at a later date. 
Table Y. — Davy's Specific Gravity Observations. 
Temperature. 
Density. 
Tide. 
Wind. 
1842. 
Air. 
Sea. 
Sept. 80, 
3 
0 P.M. 
55 
54 
1-0258 
Low water. 
N.E. 
Oct. 29, 
2 
o „ 
43 
45 
251 
i ebb. 
NT. 
Nov. 30, 
3 
0 „ 
45 
42 
256 
» 
W. 
1843. 
Jan. 5, 3 
0 „ 
39 
42 
248 
| flood. 
K 
Feb. 5, 
3 30 „ 
35 
38 
197 
\ flood. 
NT. 
Feb. 19, 
3 
30 ,, 
39 
38 
242 
9 9 
S.E.- 
March 4, 
2 
0 „ 
39 
38 
205 
,, 
N.W. 
April 22, 
2 
0 „ 
55 
44 
248 
99 
W. 
Dr Stevenson Macadam investigated the salinity of the Firth of 
Clyde in 1855.* He observed the specific gravity at more than 
fifty places, and determined the total solids and chlorine in each. 
He found that between Bowling and Renfrew there was a change 
produced by the tide between high and low water equal to that 
discerned in a distance of five miles along the firth at low water. 
In subsequent investigations he examined the Firths of Cromarty 
and Inverness. The results are recorded in the Proceedings of this 
Society for 1866, f 
Professor Kyle of Buenos Ayres made some observations in 1874 
on the River Plate, in the same way as Dr Macadam on the Clyde. 
I am indebted to Mr F. Newman for a translation of Kyle’s 
Spanish pamphlet (Algunos datos sobre la composicion de las aguas 
del Rio de la Plata), and for a chart of the Plate, with the water 
sampling stations. 
The results brought out by Professor Kyle are interesting, but 
like the other observers cited above, he neglects to mention whether 
* Brit. Assoc. Reports, 1855, ii. 64. 
t Proc. Roy. Soc. Edin., Y. (1866), p. 370. 
