If Dr. Thorndike tried his intelligent "Experiment No. 11" with a two-year-old cat, why didn't he try it with a two-year-old human? I guess he would have found an equal amount of ignorance of the mechanism of door fastenings, which comes only with teaching, and would have produced only struggles and screaming. THE TREND OF POPULATION IN MAINE. _Editor Popular Science Monthly:_ SIR: In the article contributed to your magazine for the month of August on Recent Legislation against the Drink Evil, I notice what appears to me to be a misstatement of fact. The writer speaks of the results of prohibition in the State of Maine, and says, "In sixty-three years Maine has seen her commerce disappear and her population dwindle." I have not investigated the matter of Maine's commerce, but I find that her population has not dwindled in any possible sense of the term during the period indicated above. It is, perhaps, a common impression that Maine has had such an exodus of her people to other States of the Union that she has suffered a loss in population. What are the real facts of the case? The census taken by the Government in 1840 gave the State 501,000 people, and that taken in 1890, 661,000, which shows, during the interval between 1840 and 1890, an increase of 160,000. The increase in population even during the decade 1880-'90 was 13,000. Whether there has been a decrease since 1890 nobody at present knows, and will not know until the decennial census is taken next year. In view of these facts, I feel justified in challenging the correctness of the gentleman's statement, quoted above. There can be no room for doubt that Maine has sustained considerable losses in population from farm desertion, but no statistics can be presented to show that the State has, during the time stated above, been dwindling in the number of people living within her borders. J. EARLE BROWN. WOONSOCKET, R. I., _August 17, 1899._ Editor's Table. _EDUCATION AND CHARACTER-BUILDING._