A clear, fair, and candid investigation of the population, commerce, and agriculture of this kingdom : with a full refutation of all Mr. Malthus's principles, proving, from infallible documents, that our population is rapidly decreasing, from the high price of grain, and the long and unfortunate war, and if not remedied, England may fall : also shewing the great impolicy of the late corn bill, and that the high price of grain has been the cause of the late blights.