34 



BULLETIN 227, U. S. DEPARTMENT OF AGRICULTURE. 



Table IV. — Toxicity of various preservatives to certain wood-destroying and other fungi — 



Continued. 



Toxic substance. 



Organism. 



Toxic point. 



Culture 

 medium. 



Duration of 

 test. 



Investigator. 



B. — ORGANICCOMPOUNDS— 



continued. 



(6) Tars and creosotes — 

 Continued . 



Coal-tar creosote — Contd. 

 With 10 per cent fil- 

 tered tar added. 

 With 20 per cent fil- 

 tered tar added. 

 Coal tar (undistilled, sp. 



gr. 1.194 at 15.5° C.J. 

 Coal-tar creosote: 



Fraction I (sp. gr. 

 0.934 at 60° C, 78.3 

 per cent distills be- 

 low 215° C). 



Do 



Fraction II (sp. gr. 

 1.003 at 60° C, 9 per 

 cent distills below 

 205° C, 95.9 per 

 cent below 287° C). 



Do 



Fraction III (sp. gr. 

 1.045 at 60° C 73.7 

 per cent distills be- 

 low 295° C). 



Do 



Fraction IV (sp. gr. 

 1.088 at 60° C 54.3 

 per cent distills be- 

 tween 285° and 320° 

 C). 



Do 



Fraction V (10 per 

 cent distills above 

 320° C, 36.6 per 

 cent hard residue). 



Do 



Fraction below 235° C. 

 Fraction between 



235°-272° C. 

 Fraction above 272° C. 



Anthracene, pure. . 

 Naphthalene, pure. 



Quinolin, pure 



Paraffin, pure 



Water-gas tar distillate: 

 Fraction between 



170°-340° C. 

 Fraction between 

 170°-315° C. (sp. gr. 

 1.024 at 15.5° C). 

 Fraction between 

 210°-315° C. (sp. gr. 

 1.053 at 15.5° C). 

 United Gas Improve- 

 ment Co. oil (sp. gr. 

 1.058 at 60° C). 



Do 



Sp. gr. 0.995 at 60° C. 

 Wood creosote (softwood, 

 sp. gr. 1.052 at 60° C— 

 about 8 per cent HjO). 



Do : 



Wood tar (hardwood, sp. 

 gr. 1.195 at 60° C). 

 Do 



Semiasphaltic petro- 

 leum (sp. gr. 0.973 at 

 15.5° C: distills above 

 315° C). 



Penicillium . 



....do 



Molds 



Per cent. 

 0.30 



Between 1.5 

 and 2. 



Fomes annosus. 



0.30.. 



F. pinicola 0.225 



F. annosus 0.225 



F. pinicola. 

 F. annosus. 



F. pinicola. 

 F. annosus. 



F. pinicola. 

 F. annosus. 



F. pinicola 7.8 



Penicillium 0.35 . . . 



do i 0.25... 



0.15.. 

 0.325. 



0.125. 

 3.3... 



0.125 



33 



.do. 



.do. 

 .do. 



-do... 

 .do... 



Polystictus versicolor 

 Penicillium 



.do Above 10 



Between 4 

 and 4.5. 



Above 10.... 



Between 9 

 and 10. 



0.10 



Above 10 



0.40. 

 2.... 



Agar. 

 ..do.. 

 ..do.. 



..do.. 



..do. 

 ..do. 



.do. 

 .do. 



.do. 

 .do. 



.do. 

 .do. 



.do. 

 .do. 

 .do. 



.do. 



.do. 

 .do. 



.do. 

 .do. 



.do. 



.do. 



4 weeks 



do 



do 



4 to 6 weeks. 



do 



5 to 9 weeks. 



4 to 5 weeks. 

 4 to 8 weeks. 



4 to 7 weeks. 

 4 to 6*weeks. 



5 to 8 weeks. 

 4 to 6 weeks. 



5 to 8 weeks. 



4 weeks 



do 



J. M. Weiss. 

 Do. 

 Do. 



Humphrey and 

 Fleming. 



..do. 



.do. 

 .do. 



do 



do 



4 weeks . 



Fomes annosus. 



Above 40. 



.do. 

 .do. 



.do. 



F. pinicola Above 40... 



F. annosus j About 0.65 . 



....do 0.65 



F. pinicola. 

 F. annosus. 



F. pinicola.. 

 Penicillium. 



0.20.... 

 1.25.... 



0.75 



Above 10. 



.do. 



.do. 



.do. 



.do. 



.do. 



.do. 

 .do. 



4 to S weeks. 



4 to 5 weeks. 



5 to 8 weeks. 

 4 to 7 weeks. 



4 lo 6 weeks. 

 do 



4 to 5 weeks. 

 4 weeks 



Do. 

 Do. 



Do. 

 Do. 



Do. 

 Do. 



Do. 

 Do. 



Do. 



J. M. Weiss. 



Do. 



Do. 



Do. 

 Do. 



Do. 

 Do. 



Dean and 



Downs. 

 J. M. Weiss. 



Humphrey and 

 Fleming. 



Do. 

 Do. 

 Do. 



Do. 

 Do. 



Do. 

 J. M. Weiss. 



In conclusion, the writers wish to emphasize that any scale of 

 toxicities derived from Petri-dish tests on the usual nutrient agar or 



