APPENDIX. 



345 



APPENDIX C— P. 270. 

 Report on the Wardie Ironstone. By William Gregory, Esq. M.D. Prof, of Chemistry. 



Edinburgh^ Uth May 1836. 



I have examined the three samples of Wardie Ironstone with the greatest care. 



No. 1, from a depth of 20 fathoms 5 feet, contains in the calcined state, as given to me, in 100 parts — 



Matter insoluble in Acid (Sand), 19.6 



Peroxide of Iron, 72.6 



Alumina (Clay), 3.5 



Lime (a Trace), 0.0 



Moisture and Loss, 4.4 



100.0 



No. 2, from a depth of 26 fathoms 4 feet, contains, in a calcined state, in 100 parts — 



Insoluble Matter, 37.8 



Peroxide of Iron, 56.4 



Alumina, 2.5 



Lime (a Trace), 0.0 



Moisture and Loss, 3.8 



100.0 



No. 1, when calcined, contains therefore about Fifty per cent, of pure Iron, calculated in the metallic 

 state ; and No. 2 Forty per cent, nearly. 



No. 3, in its natural state, contains in 100 parts — 



Insoluble Matter, 19.3 



Protoxide of Iron, 45.9 



Alumina, 1.5 



Water and Loss (a Trace of Lime), Carbon, &c. . . . 33.3 



100.0 



The Metallic Iron here is 32.2 per cent. ; the reason of the difference is, that, by the calcination, a quan- 

 tity of water was expelled, so that in Nos. one and two, the quantity of iron is increased in proportion to the 

 weight of the mineral analyzed. 



All the ores are remarkablj' good ; and there can be no doubt, that, with the addition of lime, and other 

 necessary fluxes, they will work admirably. I have scarcely seen any ores of the coal-field containing so 

 much as Forty-five per cent. Protoxide ; and it is probable that Nos. 1, and 2, contain a good deal more 

 than this. All, I have no doubt, in the natural state, contain, as No. 3 does, some carbonaceous matter ; but 

 the quantity of this is not large. 



I have much pleasure in making the foregoing Report, which is even more favourable than I had antici- 

 pated. The quality of your ironstone is not to be surpassed, scarcely equalled, in any ironwork in Scotland 



WILLIAM GREGORY, M.D. 

 To Captain J. D. Boswall, R. N. of Wardie. 



Note. — I understand from Captain Boswall that the iron-ore above reported on consisted of beds or bands 

 about 17 inches in thickness, and situated at a depth of from 20 to 30 fathoms from the surface. 



I may mention in connection with this subject, that there is a stratum of yellow ochre — (alumen and red 

 oxide of iron), — situated between the North Greens Coal and its subjacent limestone. At Easter Dudding- 

 stone, this stratum is about 6 inches thick,— at Dryden it is from 16 to 18 inches. At the latter place, it is 

 worked, and is sold in Edinburgh at the rate of a guinea per ton. 



VOL. XIV. PART I. XX 



