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 gray ness, 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.* 
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 “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. 
