PROLOGUE 



EXPLANATION OF PLATES XXII AND XXIV. 



Reference to these plates was unfortunately overlooked when 

 the text was going through the press. 



These plates are simply extras. They were made at an early 

 stage in the preparation of the work and discarded; but were 

 finally inserted, merely to add to the number of colors represented. 



that this work: is oasea on a. muiuu S u o^^ _ 



from every standpoint, and that practically all authori- 

 tative works on the subject of color have been carefully 

 consulted.* 



Plan. — The scientific arrangement of colors in this 

 work is based essentially on the suggestions of Professor 

 J. H. Pillsbury for a scheme of color standards,! which 

 have also been the basis of several other efforts toward the 

 same end, as the plates in Milton Bradley's u Elementary 

 Color'' and educational colored papers, Prang's charts of 

 standard colors, Klinkseick and Valette's ''Code des 

 Couleurs," etc.; but while all these present a scientifi- 

 cally arranged color-scheme and more or less adequate 



^Titles of several books on the subject which are especially recommended to the 

 lay student of chromatology are given at the end of this text. 



fSee Science, June 9, 1893, and Nature, Vol. LII, No. 1347, Aug. 22, 1895, pp. 

 390-392. 



