PROLOGUE 



As stated in the Preface, the purpose of this work 

 is the standardization of colors and color nomenclature, 

 so that naturalists or others who may have occasion to 

 write or speak of colors may do so with the certainty 

 that there need be no question as to what particular tint, 

 shade, or degree of grayness, of any color or hue is 

 meant. Therefore, it is unnecessary to treat of the subject 

 from any other point of view ; it will be sufficient to say 

 that this work is based on a thorough study of the subject 

 from every standpoint, and that practically all authori- 

 tative works on the subject of color have been carefully 

 consulted.* 



PivAN. — 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 " 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. 



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

 390-392. 



