IDENTITY OF COAL-TAR COLORS, 1907. 17 



CLASSIFICATION OF SAMPLES SUBMITTED. 

 GREEN TABLE NUMBERS. 



Out of the 284 specimens contributed, or reported on, 172 (60.6 

 per cent) were identified as to their chemical composition, by refer- 

 ence to the Green Tables; 6 (2.1 per cent) were otherwise unequivo- 

 cally identified chemically, and for 106 (37.3 per cent) the makers, 

 or their responsible agents, declined to state the chemical composi- 

 tion, i. e., 62.8 per cent were unequivocally identified, and the remain- 

 ing 37.3 per cent were not so identified. 



The specimens submitted are therefore divisible into the following 

 three classes: 



Class I. Those for which numbers were given in the Green Tables, 

 numbering 172. 



Class II. Those whose composition was given in chemical language, 

 numbering 6. 



Class III. Those whose composition was not given in any lan- 

 guage capable of correct and certain translation into chemical terms, 

 numbering 106. 



Consider Class I. The Green Tables, page VI, divide the coal-tar 

 colors into 21 groups, comprising 695 different chemical individual 

 coal-tar colors. The 172 members of Class I number in all 74 indi- 

 viduals, or 10.6 per cent of the Green Tables, and fall into 11 of the 

 21 groups of those Tables. 



The following table classifies the samples according to the Green 

 Table groups: 



Green Table groups and number of collected samples falling within them. 



97291 Bull. 14712 2 



