Sieam-Boat.~—Malvern Waters.—Ancient Coal-Mines. 149 
STEAM-BOAT. 
We have omitted in its proper place a note relative to the 
Plate given with the article on the Steam-Boat, in the present 
Number. The dotted lines at the side of the paddle-wheels are 
intended to indicate that the wheels may be made to occupy 
the whole breadth of the stern of the vessel. 
MALVERN WATERS. 
A correspondent having requested information respecting the 
analysis of the Malvern Well, alluded to in p. 231 of our last 
volume, we insert the result from Dr. Philip’s work on this 
subject, published so far back as the year 1805. 
The contents of one gallon of the Holyweil water are: 
Carbonate of soda ........... 5'd3 grs. 
Garbonate. of lime ........0e.: 16 
Carbonate of magnesia ....... 0°9199 
Carbonate of iron.....eee-.0. 0°625 
Sulphate of soda,..s 5,.:05) 0, elle» pi 21890 
Muriate of soda ...ccececrene cad 
Resid oye isisis drajey gee oOo 
146,109 
OF the water of St. Ann’s Well, Dr. Philip gives the following 
_ as the contents of a gallon: 
Carbonate of soda... .u.dcdecesae Ge 
Carbonate of lime..........02..- 0°352 
Carbonate of magnesia..........- 0°26 
Carbonate of irom... 362. 0e.+ 000. 0928 
Sulphate of soda........eeeee02- 148 
Muriate of soda ....esseesereees (959 
Residuum ....50.scpecccsee | OAL 
ANCIENT COAL-MINES. 
A Dublin paper gives the following account of the ancient 
coal-mines lately discovered at the Giants’ Causeway: 
“There were five pits of coal opened in Port Ganneye, west of 
the Giants’ Causeway; the westernmost of which is 244 feet 
* This residuum was found to be insoluble jn the sulphuric, muriatic, 
and nitric acids; also in solutions of the alkaline carbonates and of am- 
monia, and in alcohol; but with the assistance of heat dissolved very na- 
pidly in a strong solution of potash or of soda, The author concludes, that 
this residuum consists of particles separated from the surface of the glass 
retort by the action of the water when boiling, and that the soda is the 
priucipal agent in producing this separation, ~ 
above 
