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85

Necessary hints to those who would be rich

Advice to a young tradesman

The may to make money plenty in every man's pocket 88

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The art of procuring pleasant dreams.

Precautions to be used by those who are about to under-

take a sea voyage.

. 113

Dialogue between Franklin and the Gout

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The ephemera an emblem of human life.
Account of a whirlwind at Maryland

On the saltness of sea water

On the effect of air on the barometer, and the benefits
derived from the study of insects

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On the causes of colds.

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Tendency of rivers to the sea.-Effects of the sun's

rays on cloths of different colours

On the magnetism and theory of the earth

Queries and conjectures relating to magnetism and the

theory of the earth

On the nature of sea coal

Effect of vegetation on noxious air

Observations on the prevailing doctrines of life and

death

END OF VOL. L

T. Davison, Printer, Whitefriars.

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TRIOX LIBRARY

NEW YORK

ESSAYS AND LETTERS

ON

COMMERCIAL AND POLITICAL SUBJECTS.

OBSERVATIONS CONCERNING THE INCREASE OF MANKIND, PEOPLING OF COUNTRIES, &c.

Written in Pennsylvania, 1751.

1. TABLES of the proportion of marriages to births, of deaths to births, of marriages to the number of inhabitants, &c. formed on observations made upor the bills of mortality, christenings, &c. of populous cities, will not suit countries; nor will tables, formed on observations made on full settled old countries, as Europe, suit new countries, as America.

2. For people increase in proportion to the number of marriages, and that is greater, in proportion to the ease and convenience of supporting a family. When families can be easily supported, more persons marry, and earlier in life.

3. In cities, where all trades, occupations, and offices are full, many delay marrying till they can see how to bear the charges of a family; which charges are greater in cities, as luxury is more common: many live single during life, and continue servants to families, journeymen to trades, &c.

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