Bui. 227, U. S. Dept. of Agriculture. 



Plate III. 



Toxicity Studies: Petri-Dish Cultures of Fomes annosus and Fomes pinicola.— II. 



Pigs. 25 and 26. — F. pinicola on different concentrations of United Gas Improvement Co. 1.07 oil, 

 No. 1101, after about 5 weeks: 25, On 20 per cent; 26, on 40 per cent. Figs. 27 and 28. — F. anno- 

 sus on different concentrations of water-gas tar distillate (sp. gr. 0.995 at 60° C), after 6 weeks: 

 27,On 0.2 per cent; 28, on 0.3 per cent. Fig. 29. — F. annosus on 2.2 per cent concentration of 

 S. P. F. carbolineum after about 6 weeks. Fig. 30. — F. annosus on 0.15 per cent concentration 

 of coal-tar creosote, Fraction III, after 6 weeks. Figs. 31 to 35. — F. pinicola on different con- 

 centrations of wood creosote (Douglas fir) after about 2^2 weeks: 31, Check; 32, on 0.05 per cent; 

 33, on 0.1 per cent; 34, on 0.125 per cent; 35, on 0.15 per "cent. Figs. 36 and 37. — F. annosus on 

 different concentrations of wood creosote (Douglas fir) after about 4 weeks: 36, On 0.2 per cent; 

 37, on 0.4 per cent. Figs. 38 and 39. — F. annosus on different concentrations of cresol calcium 

 after about 6 weeks: 38, On 0.14 per cent; 39, on 0.28 per cent. 



