ON THE ACTION OF AIR AND WATER UPON IRON. 223 
published analyses*. Its specific gravity is = 1027:80; and 
100 cubic inches of the water taken from the surface contain, 
in combination, 1:43 cubic inch of gas, which proves to be 
atmospheric air, with traces of carbonic acid, or about one 
volume in seventy. This water is beautifully pellucid, and 
free from suspended inorganic matter. Its boiling point in 
glass is 214°5 Fahr., barom. 29-7 inches. 
145. The following table of the amount of saline contents 
of sea water, from various localities, may be interesting, as 
bearing upon our subject :— 
Table of Saline Contents in 1000 parts of Sea Water. Authorities. 
meretic mica 27/202 9, Ae, 28°30 Marcet. 
Arctic Seasea water . . 3°50 
Worth Atlantie “oy 5~ 5 42°60 
Equator Bacal Sekar nek RM A Ti 
Bauch Atlantic el ei) ) kee 41°20 
39 
33 
39 
39 
Prediterraneanr®” "8400 ven | ray 39°40 Laurent 
Seaof Marmora. . . . ., 42-00 Marcet. 
etek Wea Fry ie Ans Uy 21°60 
39 
3) 
Rear © I Ly ody: Se toasters 6°60 
tera reat). vegies Asti Ylang beaag “fe 
British Channel . 2... , 35°50 Sweitzer. ° 
enn ects WON. Pinsshtoga: 0s 33°76 Mallet. 
146. One thousand volumes of sea water are stated, on the 
authority of Laurent, Bouillon, and Lagrange, to contain 62 
volumes of carbonic acid. I have never been able to find as 
much. Dr. Marcet also states that ammonia is occasionally 
present in it. 
147. The water of No. 2, or that of the foul sea water, taken 
from the mouth of the great Kingstown sewer, is found full of 
putrid organic matter of a black and white colour, exhales an 
intolerable foetor, and is permanently milky or opalescent. A 
cubic foot of it contains 1379°5 grains of solid matter at a 
Minimum, and varies, up to the full saline contents of the sea 
‘Water, according to the degree of dryness of the weather, and 
Consequent greater or less admixture of fresh water. The 
Water in sitw constantly evolves bubbles of hydrosulphuric 
acid and pond-gas = (H, C), of which torrents may be ob- 
tained by stirring the mud at the bottom; its solid constituents 
are the same as those above given for the sea water of the har- 
bour, with a very variable proportion, however, of carbonate 
and sulphate of lime and of chloride of calcium, derived from 
the fresh water which mingles with the salt. It holds, com- 
* Marcet, Laurent. 
