CULTURAL WORK OX THE PUKGtTS. 



25 



Experiment No. IS. 



1,150 c. c. formalin per 1.000 cubic feet of air space. 

 Temperature before mixing reagents, 75 : F. 



Thielaviopsis cultures in petri dishes. 



Initial Vigorous 



growth growth 



of fungus, of fungus. 



Hours. 



Checks: fungus not exposed to formaldehyde gas 20 



Fungus exposed 15 minutes 216 



Fungus exposed 30 minutes 240 



Fungus exposed 60 minutes 



Hours. 

 49 



2-57 

 



Expi riment No. 1 ). 



1,150 c. c. formalin p»-r 1,000 cubic feet of air space. 

 Temperature before mixing reagents, 66" F. 



Thielaviopsis cultures in petri dishes. 



Initial Vigorous 



growth growth 



of fungus, of fungus. 



Checks: fungus not exposed to formaldehyde gas 



Fungus exposed 15 minutes 



Fungus exposed 30 minutes 



Fungus exposed 60 minutes 



Hours. 



Hou rs. 



29 



64 



72 



100 



240 



2M 











Expi rinu nt No. 15. 



1.150 c. c. formalin per 1.000 cubic feet of air space. 

 Temperature before mixing reagents. 7>; F. 



Thielaviopsis cultures in petri dishes. 



Initial Vigorous 



growth growth 



of fungus, of fungus. 



Checks: fungus not exposed to formaldehyde gas 



Fungus exposed 15 minutes 



Fungus exposed 30 minutes 



Fungus exposed 60 minutes 



Hours. 



Hours. 



23 



50 



























Experiment No. 16. 



1,200 c. c. formalin per 1.000 cubic feet of air space. 

 Temperature before mixing reagents. 70* F. 



Thielaviopsis cultures in petri dishes. 



Initial 



growth 



of fungus. 



Checks: fungus not exposed to formaldehyde gas 



Fungus exposed 15 minutes 



Fungus exposed 30 minutes 



Fungus exposed 60 minutes 



171 



Hours. 

 19 

 

 

 



Vigorous 



growth 



of fungus. 



Hours. 



