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Show The Com mem Fly. The common fly lays more than one hundred eggs, and the time for egg lay -hag to maturity is only about two weeks. Most of us have studied geometrical progression. pro-gression. Here we see It illustrated Suppose ono fly commences "to multipJy and replenish the earth" about June 1. June i5, if all lived, would give 150. Suppose 75 of these are females, July I would give us, supposing no cruel wap or other untoward circumstances to interfere, in-terfere, 11 .359 flies. Suppose 6.625 of these are females, we might hare, July 15, $43,720 fUe&-ew Yorlt Telegram. |