il. 227, U. S. Dept. of Agriculture 
ifflMIWWHT'i s\ W 
Plate II. 
Toxicity Studies: Petri-Dish Cultures of Fomes annosus and Fomes pinicola.-I. 
Figs. 10 and 11. — F. annosus on different concentrations of coal-tar creosote, Fraction I, after 5 
weeks: 10, on 0.275 per cent; 11, on 0.3 per cent. Figs. 12 and 13. — F. pinicola on different 
concentrations of coal-tar creosote, Fraction II, after by 2 weeks: 12, On 0.125 per cent; 13, on 
0.15 per cent. Figs. 14 to 19. — F. pinicola on different concentrations of coal tar creosote, 
Fraction IV, after 9 weeks: 14, Check; 15, on 0.025 per cent; 16, on 0.05 percent; 17, on 0.075 
per cent; 18, on 0.1 per cent; 19, on 0.125 per cent. Figs. 20 to 23. — F. annosus on different 
concentrations of coal-tar creosote, Fraction V, after 7 weeks: 20, Check; 21, on 0.1 per cent; 
22, on 0.5 per cent; 23, on 1 per cent. Fig. 24. — F. pinicola on 1 per cent concentration of coal- 
tar creosote, Fraction V, after 6 weeks. 
i 
