INTRODUCTION.

XVII

sierras, would be equally fruitless. Then there isreformed Portugal , our old and valuable ally, she can-not pretend to manufactures,—are her inhabitants pat-terns of virtue ?

4. In 1797, Mr. Macintosh was mainly instrumen-tal in introducing into Scotland the manufacture ofalum from native materials, at Hurlet, and afterwai’dsat Campsie. See pp. 45, 46, 47, 48.

5. He invented the surface evaporating reverbera-tory furnace for fluids. See pp. 48, 49.

6. He modified and improved Baume’s hydrometer.

7. He first established in Scotland the manufactureof Prussian blue , (ferro-cyanodide of iron,) and of prus-siate of potash, (ferro-cyanodide of potash,) and in-vented and introduced into use the mode of dyeing andcalico-printing with the latter salt. See p. 49.

8. He suggested, (in 1806,) to the East India Com­ pany a new and improved method for the conveyanceto Europe of saltpetre. See pp. 60, 61, 62.

9. In 1805, he suggested to the East India Com­ pany a substitute for the copper-sheathing of vessels, in"which the principles of Sir Humphrey Davy’s galvanicprocess of sheathing, (of 1823,) were to a certain extentdeveloped. Neither of these two last processes wascarried into effect by the Company. See pp. 59, 60.

10. In 1807, he first invented the process, sincegenerally adopted and continued in use, for concentrat-