84 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 Page 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 The ephemera an emblem of human life. On the saltness of sea water On the effect of air on the barometer, and the benefits On the causes of colds. . 119 125 . 132 134 135 . 138 . 140 142 145 . 150 . 153 . 154 . 155 . 160 165 169 . 170 .171 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. 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. |