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Page The Busy-Body, No. I.

3 II.

6 III. IV.

13 V.

20 VIII.

30 Dialogue between Philocles and Horatio

36 A second dialogue

42 Public men

49 Self-denial not the essence of virtue

55 On the usefulness of the mathematics

58 On true happiness

6.3 On discoveries

65 The waste of life

69 The way to wealth

73 Necessary hints to those who would be rich

84 Advice to a young tradesman

85 The may to make money plenty in every man's pocket 88 New mode of lending money

89 An economical project

90 On early marriages

96 Effect of early impressions on the mind

98 The whistle

101 A petition to those who have the superintendency of education

104 The handsome and deformed leg Morals of chess

108

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The art of procuring pleasant dreams

113
Precautions to be used by those who are about to under-
take a sea voyage . .

119
Dialogue between Franklin and the Gout

125
A parable against persecution
On the death of relatives
The ephemera an emblem of human life

135
Account of a whirlwind at Maryland
On the saltness of sea water

140
On the effect of air on the barometer, and the benefits

derived from the study of insects
On the art of swimming
On the same subject
On the free use of air.
On the causes of colds,

154
Tendency of rivers to the sea. Effects of the sun's

rays on eloths of different colours
On the magnetism and theory of the earth

160
Queries and conjectures relating to magnetism and the

theory of the earth
On the nature of sea coal
Effect of vegetation on noxious air

170
Observations on the prevailing doctrines of life and

death

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END OF VOL. L.

T. Davison, Printer, Whitefriars.

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ESSAYS AND LETTERS

ON

COMMERCIAL AND POLITICAL SUBJECTS.

OBSERVATIONS CONCERNING THE IN.

CREASE 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 num,ber 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 inore common: many live single during life, and continue servants to families, journeymen to trades, &c.

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