Mdrulingds, the farcocele fometimes met with among their chiefs, *p* 90* Similarity 
of cultoms between them and the Bambaras, p. 92. 
Marab buts, Mahometan prieils, fome account of, p. 90, 
Marjball , William, Efq. See Black Canker Caterpillar, 
Maupcrtuis , M. See ^ulcbjther. 
Mayer , Tob. See bun and Solar Syflcm. 
Mercurial Congelation , Experiments for afcprtaining the point of, by Mr. Thomas 
Hutchins, governor of Albany Fort, in Budfon’s Bay, p. *3.03. Letter from Dr. 
Black, giving an account of his method of determining the point of congelation, p. 
*305. Thermometers defcribed, p. *307. Tables comparing the different ther- 
mometers, p. *308 — *315. Exp. I. p. *3 1 6--— *3 19. Remarks and obfervations on 
• exp. I. *319. Exp. II. p. *323 — *327^ Obfervations on Exp. II. p. *327, *328. 
Exp. III. p. *329. Obfervations on exp. III. _p. *330. Exp. IV. p. *331 — *341* 
Obfervations on exp. IV. p. "342. Exp. V. p. *343. 'Obfervations on exp. V. p^ 
*344. Exp. VI. p. *345 — * 353 - Obfervations on exp. VI. p. *353— "* 357 * 
Exp. VII. p. *358 — *360. Obfervations on exp. VII, p. *360 — *362. Exp. 
VIII. p. *362 — '*365. Obfervations on exp. VIII. p. *365, *366. Exp. IX. p. 
*366. Exp. X. p. *368. Quicklilver frozen by the natural cold in Iiudfon’s Bay, 
*369. Explanation of plate VII. *370. 
. Metallic earth. See Mineral Acid. 
Micbell , Mr. See Sun and Solar Syjlem. 
Micrometer , almoft every fort is liable to fome inconveniences and deceptions, p. 4, 
Many defers in that with moveable wires are caufed by the conftru&ion of the eye- 
glalfes of the telefcopes to which it is applied, p. 94, 
Mineral acids. Conclufion of the experiments and obfervations concerning the attrac- 
tive powers of, by Richard Kirwan, Efq. p. 15. Solution of iron in the vitriolic 
aeid, p. 16. Iron in the nitrous acid, p. 17. Iron in the marine acid, p. 18. 
-Copper in the vitriolic acid, p. 18. Copper in nitrous acid, ibid. Copper in 
marine acid, p. 20. Tin in the vitriolic acid, ibid. Tin in the nitrous acid, p. 2 r. 
Tin in the marine acid, ibid. Lead in the vitriolic acid, ibid. Lead in the nitrous 
acid, p. 22. Lead in the marine acid, ibid. Silver in the vitriolic acid, ibid. 
' Silver in the nitrous acid, p. 23. Silver in the marine acid, ibid. Gold in aqua 
regia, p. 24. Mercury in vitriolic acid, p. 25. Mercury in nitrous acid, ibid. 
Mercury in marine acid, ibid. Zinc in vitriolic acid, p. 26. Zinc in nitrous acid, 
ibid. Zinc in marine acid, p. 27. Bifmuth in vitriolic acid, ibid. Bifmuth in 
nitrous acid, ibid. Bifmuth in marine acid, p. 28. Nickel in vitriolic acid, ibid. 
Nickel in nitrous acid, ibid. Nickel in marine acid, ibid. Cobalt in vitriolic 
acid, ibid. Cobalt in nitrous acid, p. 29. Cobalt in marine acid, ibid. Regulus 
4 of 
