I 1ST D E & 
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Literature and philofophy, multiply the fources of pleafure 9 
_ _* are ufeful to the gentleman 10 
—-—--to the merchant 11 
.--. furnilh agreeable amufement 14 
London , bills of mortality, quoted from 1728 to 1758 362 
Longevity, obfervations on by Dr. Fothergill 355 
--tables of - - 557* 35 s > 3 6 ° 
—-— depends on air. Sec. 365 ; foods, &c. 367 ; mo¬ 
tion and reft, 369; fecretions, &c. 369; affeclions 
of mind, 369 
M. 
. "Machine , for impregnating water, &c. with fixed air 5 2 
Machines, generally invented by perfons not educated to 
mechanic employments - - 82 
Magellan, Mr. his letter to Mr. Henry on the infufi- 
bility of magnefia - 466 
Magnefan earth, its natural and chemical hiflory 448 
■ .— various combinations in which it is 
found - - - 452 
--- — its origin - - - 455 
--infufibility afcertained - 465 
. .— --folubility in acids when calcined proved 469 
--- not phofphoric - - 473 
Manners, rude and ferocious, in mountainous and uncul¬ 
tivated countries - - - 281 
Manufactures, cotton in particular, depend upon machines 80 
Mars, his fymbol explained - 253 
Medici, the family of, their charader by lord Orrery 238 
Memory, peculiarly ftrong in blind perfons - 175 
Merchant, importance of talle for literature in him 1 1 
Metcalf, John, though blind, a celebrated furveyor 
and projector of highways - - 172 
Milton defended 71 
- fuperior to Homer and Virgil in unity of adion 130 
Mind, human, improperly faid to confift of feveral diftind 
powers - - - - 377 
Miners, 
1 
