18 



BULLETIN 810, U. S. DEPAETMEXT OF AGRICULTURE. 



fection results the germ is considered as having been destroyed. 

 Observations have been made on the virus kept at incubator, room, 

 outdoor, and refrigerator temperatures and shielded from the light 

 in each instance. The experiments conducted with Bacillus plwton 

 in these environments are summarized in Tables II, III, IV, and 

 V which follow : 



Table II. — Resistance of Bacillus plvton to drying at incubator temperature 



July 3 . . . 

 July 10.. 

 July 17.. 

 July 25.. 

 Aug. 3... 

 Aug. 15.. 

 Sept. 1 . . 

 Sept. 16. 

 Sept. 29. 



June 29.. 

 July 13 . . 

 JulyQ... 

 Sept. 20. 

 Sept. 17. 



Sept. 8. 



Date of inoculation. 



Period of exposure. 



Months. 



Results of inoculation. 



JSuropean foulbrood produced. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



Do. 

 Do. 

 No disease produced. 

 Do. 

 Do. 



Do. 



Table III. — Resistance of Bacillus pluton to drying at room temperature 



Table l\. —Resistance of Bacillus pluton to drying at outdoor temperature 



