3Q4t Index. 



Medium, what opticians mean by a, i. 145. 



Melting pots of different substances, list of, ii. 68. 



Menstruums, what so called in chemistry, ii. 33. 



Mensuration of the earth, how effected, i. 331 to 337. 



Mercury, particulars concerning this planet, i. 305. See 

 also 290 to 29/>. 304. 



Mercury, its chemical properties, ii. 247, 248. 



Metal, its advantages and disadvantages as a material for 

 the composition of chemical vessels, ii. 106. 



Metallic oxides, nature of the, ii. 22g substances, how 

 discoverable in mineral waters, 271. 



Metals, mode of ascertaining the value of, invented by 

 Archimedes, i. 45 the most powerful conductors, 105 

 simple substances in chemistry, ii. 36. 55 means of 

 detecting their adulteration, i. 44, 45 oxidizement of 

 them, ii. 44 lecture on them, 224 division of them 

 into classes, 243, 244. 



Microscope, invention of this instrument, i. 18g descrip- 

 tion of its different kinds ; the single microscope, 196 : 

 the double, or compound microscope, 191 : the solar 

 microscope, 192. 



Milky- way, i. 2()2. 



Mineral acids, the principal, considered, ii. 147 to 163. 



Mineral waters ; substances usually found in them on 

 analysis, and method of analysing them, ii. 260 to 

 275. 



Mines, circulation of air how kept up in, ii. 117. 



Mirrors, different kinds of them, and the method of 

 their action : plane mirrors, i. 165 : concave mirrors, 

 and optical deceptions with them, 169. 172. 175 : 

 convex mirrors, 171 experiment with concave mirrors 

 used as burning glasses, 1?6 distorted figures reduced 

 to symmetry by a cylindrical or a conical mirror, 176. 



Mixture, liquefactions produced by, ii. 73 lecture on its 

 chemical effects, 88 general principles with respect to 

 mixture, ib. instances of the mixture of solids with 

 fluids, 89 process of separating by heat bodies differ- 

 ing in volatility, 90 some bodies are less in bulk, and 

 others greater, when mixed, 92 different theories and 

 explications of the effects of mixture ; lord Bacon's, ib. 

 popular opinions after him, 93 Sir Isaac Newton's 

 theory, 95 affinity explained, Qti ?ome of the princi- 

 pal laws of mixture and solution, 98 a method of pro- 

 ducing heat for chemical purposes, 111. 



