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This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed w...

English economist and professor Thomas R. Malthus (1766-1834) caused great public controversy among the optimistic positivitists of his day when his Essay on the Principle of Population (1798) showed incontrovertibly that population, when unchecked, tends to increase faster than the availability of subsistence. Therefore preventive checks on population increase are necessary. Malthus, whose work influenced the research of Charles Darwin, admit...