CLASS I. 1. Bouvy, J. J. Amsterdam. — Refined salt. 2. Brandhoff Isselman, J. J. Leyden.— Dutch table salt. CLASS II. 3. Bosson, K. G. W. de, Dordrecht.— Preparations of iron, and other chemicals. 4. Diederichs, P. A. Amsterdam.—Box of water colours. 5. Elst and Matthes, van der, Amster dam.—Sublimed sal-ammoniac, and sulphate of ammonia. 6. JSTethebland Carbonisation Fac tory, Hillegersberg, near Rotterdam.—Carbo nised peat. 8. Fock van Coppenaal, G., M.D. Am sterdam.—Chemicals for technical and phar maceutical use. Pure acids, ethers, weights made of aluminium. 10. Garancine and Madder Manufac tory, Tiel.—Garancine, and other products of madder. 11. Grootes, Bros. D. & M. Westzaan. —Powder-blue, cocoa, and chocolate. 12. Groote & Romeny, Amsterdam.— Chemicals for photography. 13. Grinten, L. van der, Venlo.—Tar trate of potash and iron, in crystals. 14. Jacobs, Az. S. & A. Zwolle. — Samples of lac, varnish, and standoil. 15. Jong, H. i»e, A Imelo.—Yarnish, with specimens of application. 16. Lensing Collard, H. Leeuwarderu— A map of 1739, and engravings, restored. Ink and varnish. 17. Mendel Bour & Co. Amsterdam.— Samples of garancine. 18. Meijer, J. W. Workum, Friesland.— Butter and cheese preserver. Eau de Cologne. Cheese-dye; antifebrile herbs. 19. Muller, M. & Co. Utrecht.—Chry- sammic acid (polychromic acid). 20. Noortveen & Co. Leyden.—Chromic and Dutch green, yellow chromate. Paris blue, lac, varnish, and standoil. 21. Ochtman, van der Vliet, & Co. Zie- rikzee.—Madder, and its products. 22. Renterghem, C. A. van, & Co. Goes. —Madder, garancine, fleur de Garance, aliza rine, and colorine. 23. Spruyt & Co. Rotterdam.—Purified cod-liver oil. Salts of ammonia. Samples of ink. 24. Taconis, P. Joure, Friesland.—Dye stuff (Friesland green), and oil. 26. Verhagen & Co. Goes.—Madder and garancine products. 28. Yriesendorp, C. A. & Sons, Dor drecht.—Lac and varnish, &c.