1 
242 Proceedings of Royal Society of Edinburgh. [sess. 
8 Temperature, 40° to 50° F. 
1000 s 
1005 s "6 
1010 s 
1015 s 
1020 s 
1025 s 
1028 s 
Time 6 hours, 
0-0558 
0-0568 
0-0388 
0-0388 
0-0418 
0-0333 
„ 24 ,, 
0-1215 
0-0113 
0-0073 
0-0053 
0-0053 
0-0053 
0-0053 
„ 48 „ 
0-0048 
0-0038 
0-0025 
0-0028 
0-0031 
0-0035 
,, 72 ,, 
0-0033 
0-0018 
0-0018 
0-0013 
0-0018 
0-0018 
96 „ 
0-0658 
0-0028 
0-0013 
0-0013 
0-0013 
0-0013 
0-0013 
e Water (1024 s ) from shore at Granton. 
After 24 hours at 80° F. contained 0'0083 grin. 
,, „ 50° F. ,, 0-0188 „ 
£ Clay suspended in Salts of Sea Water. 
Temperature 80° F. 
CaS0 4 
MgCL> 
MgS0 4 
NaCl 
k 2 so 4 
Time 48 hours, .~ 
0-0013 
0-0015 
0-0023 
0-0116 
0 0563 
It will be seen that with waters of all salinities above 1010 the 
great bulk of the heavier clayey matter is thrown down in the course 
of twenty-four hours, which is in harmony with the results of pre- 
vious observers. There is, however, a small residuum which is held 
in suspension, even in waters of a salinity equal to 1028. The 
amount, it will be observed, varies with the temperature. At a 
temperature of 40 c to 50° F., and a salinity of 1027, 0-0064 grm. 
per litre of clay remained in suspension at the end of twenty-four 
hours,* while, under the same condition as to time, at a temperature 
of 80° F., only 0*0033 grm. remained in suspension.! At the former 
temperature, 00018 grm. remained suspended at the end of 106 
hours,| and at the latter only 0-0003 grm. at the end of 120 hours.§ 
It appears, then, that all the clay brought to the ocean by rivers is 
not precipitated on mixing with sea-water, but a very small quantity 
may be carried far and wide by ocean currents, the amount thus held 
* = 27,500 tons per cubic mile of water. 
t = 14,2Q0 tons per cubic mile of water. 
X = 7740 tons per cubic mile of water. 
§ = 1300 tohs per cubic mile of water. 
\ 
\ 
