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OR the purpose of avoiding confusion, and that the reader may more clearly understand the text, this work is based upon the old theory that there are three primary colors — red, yellow, and blue. Some writers contend that red, green, and bine, are the primary color sensations, and others that red, green, and violet are the primaries. We think that the experiments which are explained on pages 22 to 32, inclusive, tend to prove that the red, yellow, and blue theory is correct. It is certainly the most practical when applied to pigments, and is, therefore, the most suitable for this work.

To simplify the book as much as possible, we have selected as a foundation for it the twelve colors shown on Plate 1, including white. These colors were adopted because the writer believes that a greater variety of mixed colors can be produced from this selection than from any other containing the same number; besides, these colors are not only the most useful, but also, the most common, and best known among printers.

We could have added several other useful colors, such as umber, sienna, etc., but concluded that it was best to not make the work too complicated, and so have adhered to the original idea. Very nearly the same result could have been accomplished by leaving