INDEX. 



La Place's memoir on the tides, 239 



Lavojfier, 29, 93 



Laws, general, their eftablifliment of high 



value to fcieiice, 257 

 Lead, acetite of, remarks on, 223 — Two 



fpecles of, Jb. 

 Le Cat, 21 

 Light, on the quantity of, emitted by 



candles of different fizes, 90— Rules 



for computing, 91 

 Lights, northern, do not feem to Impede 



telefcopic vifion, 13 

 Lime, probably hurtful in tanning, 41 

 Litharge is folabie in acetous acid, 130 

 Lomet oh the employment of aeroftatic 



machines, 194 

 Ludlam, 53 

 Lute for chemical operations, preparation 



of, 140 



M. 



Machine for cleanfing chimnlcs, 255 



Magnefla, examination of a native carbo- 

 nate of, 240 — Difference between it 

 and artificial, 241 



Magnifiers, high, are not calculated for 

 fijiar obfcrvations, 8 — ^Cannot be ufed 

 while the temperature of the mirror is 

 fufceptible of alteration, 20 



Malt fpirits, method of giving the flavour 

 of brandy to, 140 



Manufcripts, Indian, of the fifteenth cen- 

 tury, 245 



MargrafF, I 



Maton, 37 



Mechanifm for equalizing the motion of a 

 fleam engine, 218 



Mendeljohn, 173 



Menftrua, thofe made ufe of in tanning 

 probably injurious, 41 



Merat Guillot, 33 



Mercury, obfervacions on its tranfit over 

 the Sun's dilk, 8 — Has no apparent at- 

 mofpbere, 9— Is truly fpherical, ib. 



Metals are combuftlble in non refpirable 

 gafes, by galvanifm, 62 — May be com- 

 bined with hidrogen, 204 

 Meteor, account of an extraordinary one 

 foen in France, 135— Account of the 

 fiery one of November laft, 279 



Meteoric ftones, fall of, 135 — Experi- 

 ments and obfervations on, ^87 



Mind and body, philofophical opinions rc- 

 fpedting, 161 



Mirrors, on the caufes which prevent their 

 (hewing objefts diftindly, 10 — Their 

 focal length affefted by changes of tem- 

 perature, 16 — Experiments to afcertain 

 this faa, 18— The figure of the re- 

 flecting furface is injured during this 

 change, 20 — A remedy fuggcftcd, 

 21 



Moifture of the air does not impede telft* 

 fcopic vifion, 10 



Molar, 253 



Monge's theory of horizontal refradlioa 

 objefted to, 47, 51 



Mont Perdu, journey to the fummit of, 

 250 



Moritz, 173 



Mofer, ib. 



Mountains of South America, curious 

 particulars refpedling, 242" 



Muriate of potalh, produdtion of, 99 



Muffin Pufchkin, 132 



Myrobalans, chemical examination of, 

 37 



N. 



Nairnc, 235 



Native iron, 188 



Natrolite, natujal hlftory of, 191 — Phy- 

 fical properties of. ib. — Analyfis of, 

 ib. — Component parts of, 193 — The 

 name derived from tlie foda it contain?. 



194 

 Newton, 56 



Nicola't 



