abbreviations under which they are designated in the descriptions of 

 the colors in the tables are as follows: 



H. A. Metz &Co., agents for Meister, Lucius & Briining (M. L. B.). 



Berlin Aniline Works (Berlin). 



American Aniline and Extract Company, agents for Brooke, Simpson & Spiller, 



Ltd., London, E. (B. S. S.). 

 Continental Color and Chemical Company, agents for F. Bayer & Co. (By.) 



and Badische Anilin- und Soda-Fabrik (Bad.). 

 Cassella Color Company (Cassella). 

 Geisenheimer & Co., agents for K. Oehler (Oehler). 

 Read, Holliday & Sons (R. H.). 

 Schoellkopf, Hartford & Hanna Company (Sch.). 

 W. F. Sykes & Co., agents for St. Denis Dye Stuff and Chemical Company 



(St. Denis), and for Coez, Langlois & Company (Coez) or (Sykes). 

 Kalle&Co. ; (Kalle). 

 Eimer & Amend (E. & A.). 

 George Griibler & Co. (Griibler). 



SOLUBILITY. 



The results given for solubility in Table I are onty approximate and 

 were obtained by shaking an excess of the color with the various 

 solvents named, filtering, if necessary, and evaporating to dryness, in 

 order to determine the amount of color dissolved. The letters used to 

 express the varying degrees of solubility are explained in connection 

 with the table. Where the color of the solution is not given it may 

 be assumed to be practically the same as that of the aqueous solution. 



The numbers in the last column of Table I are those of the corre- 

 sponding colors in Green's translation of the fourth German edition 

 of "A Systematic Survey of the Organic Coloring Matters," by 

 Schultz and Julius. 



EXTRACTION WITH IMMISCIBLE SOLVENTS. 



The determinations given in Table II were made as follows: 

 Twenty -five cubic centimeters of a 0.01 per cent solution of coal tar 

 color, or about a 0.10 per cent solution of natural coloring matters, 

 were well shaken up with 25 cc of the immiscible solvent in a sepa- 

 rating funnel. In the case of extraction with acetone the solution of 

 color was first saturated with common salt to render the acetone insolu- 

 ble. After separation into layers, the amount of color extracted was 

 determined either by the relative depth of color in the two layers or 

 by taking equal volumes of each layer and ascertaining the propor- 

 tions by dyeing tests on plain or mordanted wool. The signs 0, >i 

 (more than half), and < (less than half) indicate the amount of color 

 extracted from the aqueous solution. The color given underneath the 

 above signs indicates the color of the immiscible solvent solution, 

 unless otherwise specified. From 5 to 10 drops of concentrated 

 hydrochloric acid or ammonium hydroxid (0.95 sp. gr.) were used to 

 make the solutions acid or alkaline. 



[Cir. 35] 



