Dr. Raymond Pearl believes that in the 17th Century, world population began to rise from a relatively static figure of about 450,000,000. Now it is approximately 2,100,000,000an average density of some 40 persons to the square mile. Dr. Pearl has constructed a "logistic" curve following the population rise of the past three centuries. If this curve is not skewed by some worldwide catastrophe, if it continues to follow its geometric destiny, it will go on rising, but more slowly, and will flatten out some 160 years hence at a population figure of 2,600,000,000. Reasons: contraception, postponement of the marriage age, an...
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