149 
of solid matter contained in the water of the Irish Sea is 
somewhat greater in summer than in winter — the variation 
amounting to (H)144y o — hut the relative amount of solid 
matter present in the water of the Irish Channel is invari- 
ably less than is contained in the water of the Atlantic 
Ocean lying between the same parallels. 
According to Forchhammer, the mean proportion of the 
leading constituents of the water of the Atlantic far away 
from the shores is as follows : — 
Cl. 
so 3 . 
CaO. 
MgO. 
Total 
Salts. 
Absolute amount in ) 
1,000 grams 3 
19-885 
2-362 
0-588 
2-199 
35-976 
Relative amount 
100 
11-89 
2-96 
. 1107 
181-10 
Arranged in this manner, our determinations on the water 
of the Irish Sea give the following proportions : — 
| 
Cl. 
S0 3 . 
CaO. 
MgO. 
Total 
Salts. 
Absolute / 
Amount ' 
l Summer ... 
18-735 
2-187 
34-082 
per 1,000 
grams. < 
Winter ... 
18-627 
2-161 
0-575 
2-032 
33-838 
Relative j 
Summer . . . 
100 
11-67 
181-91 
Amount J 
„ Winter 
100 
11-83 
3-09 
10-93 
18209 
Mr. W. L. Dickinson communicated a paper containing 
the results of calculations relative to the three Occupations 
of the Planet Saturn by the Moon, April 19, July 10, and 
September 30, visible in England during the present year. 
The calculations have been made for the Observatory of the 
late Pobert Worthington, Esq., F.P.A.S., Crumpsall, near 
Manchester, Lat. 53° 30' 50 r/ *0 N., Long. 0 h 8 m 56 s T6 W. The 
