Bui. 607, U. S. Dept. of Agriculture. 



Plate II. 





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A Thin Film of a Mixture of Equal Parts, by Volume, of Creosote and 

 Normal By-Product Coke-Oven Tar No. 2 (Normal Amount of Free Car- 

 bon in Tar, 16 Per Cent, by Weight). 



Magnification, about 400 diameters. 



