To Dr. G. GRÜBLER & CO., of Leipzig, Germany, the author is under obligations for the gift of a nearly complete set of their celebrated coal-tar dyes, which have proven quite necessary to the work, especially in the coloring of the Maxwell disks on which the color scheme is based. The reproduction of the plates has been a difficult matter, involving not only expensive experimentation, but more than three years of unremitting labor. Vastly different from the ordinary lines of commercial color work, the correct copying of each one of the 1115 colors of the original plates developed many perplexing and often discouraging problems, which were finally solved through Mr. A. B. HOEN'S expert knowledge of chemistry and pigments; the skill, industry, and patience of the firm's head colorist, Mr. FRANK PORTUGAL, and the personal interest of both these gentlemen. It is, therefore, with the greatest pleasure that the author's grateful acknowledgment is made to the firm of A. HOEN & COMPANY for the satisfactory manner in which they have fulfilled their contract. CONTENTS PAGE PREFACE i PROLOGUE 1 Plan 1 Color Names 9 Color Terms 15 Table of percentages of Component Colors in Spectrum Hues 21 Table of percentages of White and Black in Tone Scales 23 Table of percentages of Neutral Gray in Broken Colors 25 Table of percentages of Black and White in tones of Carbon Gray 25 Dyes and Pigments used in Coloring of Maxwell Disks 26 Alphabetical List of Colors represented on Plates 29 Colors of old edition Not Represented on Plates 41 List of Useful Books on Color 42 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 authoritative works on the subject of color have been carefully consulted.[2]