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. 
