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It is true that you cannot make a good chemist, or even apothecary, without giving days and weeks to exact use of balances or to watching filter papers and the like but the mere layman may learn in a short time with profit the meaning of a chemical equation, and find a kind of diagrammatic knowledge sufficient to meet all he requires.
He should, however, state his observations, and as far as possible draw the results in his note-book in a diagrammatic form. He should endeavour to see if the facts are reconcilable with any other supposition than that the earth and the other planets move around the sun.
The use of the wheel can usually be detected through the slight inequalities of the clay that make a series of parallel lines on the inner surface. The diagrammatic representations of the pot-forms characteristic of various periods or of other objects ranging through a civilization the main features of which can be shown in outline will, it is hoped, be found useful.
It remained for Herman Swank, by his now famous method of diagrammatic symbolism, to bring the truth fully home. This he accomplished by living, to the limit, the native life of the Filbertese.
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