The book Outlines of Educational Doctrine was written by author Johann Friedrich Herbart Here you can read free online of Outlines of Educational Doctrine book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Outlines of Educational Doctrine a good or bad book?
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Next it should be pointed out how by finding the differ- ences of squares and cubes respectively, and then adding these dif- MATHEMATICS AND NATURE STUDY 247 ferences, the original numbers may be obtained again. A similar treatment should be accorded to figurate numbers. Small wooden disks, like checker-pawns, commend themselves for the purpose. By means of them various figures are found. The pupils are asked to indicate how many disks they need to construct one or the other kind of figures. A ...further step will be to show the increase of squares and cubes corresponding to the increase of the root, and to make this information serve as the preparation for the elementary parts of differential calculus. Now the time has come for passing on to the consideration of consecutive values of the roots, which are found to differ by quantities of continuously decreasing smallness as one progresses continuously through the number system. And so, after the logarithms of i, lo, loo, looo, etc., also of ^y j^, etc., have been gone over many times, forward and backward, the conception is finally reached of the interpola- tion of logarithms.
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