THE TOXICITY TO FUNGI OF VARIOUS OILS AND SALTS. 



25 



Fames annosus: In 12 days the radial growth of the check reached 15 mm.; 0.1 per 

 cent, 2 mm. In three weeks, 0.1 per cent showed about 20 mm.; 0.2 per cent, 5 mm. 

 In six weeks, 0.2 per cent reached 17 mm.; 0.25 per cent, 15 mm.; 0.3 per cent, 5 mm.; 

 0.35 to 0.6 per cent, from 1 to 12 mm. The growth on the toxic media was of a brighter 

 creamy appearance than that on the check. 



United Gas Improvement Co. 1.07 oil (water-gas tar distillate). 

 (PI. Ill, figs. 25 and 26.) 



[Laboratory sample No. 1101. Cooperator, United Gas Improvement Co., Philadelphia, Pa. Mobile, oily 

 liquid, with kerosene odor; specific gravity, 1.058at 60° C; flash point, 48° C; burningpoint, 65 C C; 9.04 

 per cent distills below 205° C; 24.24 per cent distills below 315° C; 67.9 per cent distills below 378° C] 





Tests. 



Times 

 killing 

 point 

 veri- 

 fied. 



Concentration of the preservative (per cent). 



Fungus. 



Num- 

 ber. 



Dura- 

 tion. 



o 



CO 



CO 



»o 



to 





o 



CM 



O 

 CO 



o 



o 



o 





31 



22 



Weeks. 

 4 to 8. . 





4 



4 

 2 



3 

 2 



2 



2 





2 



1 

 1 



1 



1 

 1 



4 





4to5.. 





2 1 



4 

















Fomes annosus: In 10 to 14 days, the radial growth of the check reached 28 mm.; 

 40 and 50 per cent, 2 mm. In four to six weeks, 40 and 50 per cent showed nearly 10 

 mm. The growth on the toxic media appeared denser and of a brighter tan color than 

 that on the check. 



Fomes pinicola: In two weeks, the radial growth of the check reached almost 40 

 mm.; 3 to 29 per cent, 2 to 7 mm. In four to five weeks all concentrations between 

 3 and 40 per cent showed 2 to 15 mm. The growth on the toxic media appeared 

 velvety, compact, and creamy, while that on the check was a fluffy white. 



Wood tar (hardwood). 



(PI. IV, figs. 41-47.) 



[Laboratory sample No. 1561. Cooperator, Marden, Orth & Hastings, Chicago, 111. Black, viscous liquid, 

 with pyroligneous odor; specific gravity, 1.195 at 60° C; flash point, 90° C; contains 24 per cent water; 11.7 

 per cent distills below 105° C; 50.9 per cent distills below 244° C; decomposition occurs above 230°.] 





Tests. 



Times 

 killing 

 point 

 veri- 

 fied. 



Concentration of the preservative (per cent). 



Fungus. 



Num- 

 ber. 



Dura- 

 tion. 



0.2 



0.5 



0.7 



0.75 



0.9 



1 



1.251 



Check. 





50 

 30 



Weeks. 

 4 to 6.. 

 4to5.. 





 1 



4 



4 



4 



4 



4 

 



4 



2 







4 





4 





1""' 







1 Based pn gum-arabic emulsions. 



Fomes annosus: In 9 to 10 days, the radial growth of the check reached 12 mm.; 

 0.5 to 0.8 per cent, 1 to 2 mm. In two to four weeks the check reached 40 mm. and 

 concentrations up to 1 per cent showed 10 to 35 mm. The growth on the toxic media 

 was dark creamy and somewhat denser than that on the check. 



Fomes pinicola: In two weeks the radial growth of the check reached 40 mm. ; 0.5 per 

 cent, 10 mm.; no growth above this. In four to five weeks 0.2 to 0.7 per cent showed 40 

 mm. ; 0.725 per cent, 10 mm. ; no growth on higher concentrations. The growth on the 

 toxic media was luxuriant, white, and fluffy. 



