^■m'^- 

 -^•«?.^-'\. 







# 



Microphotogiaphs showing: Relative Physical Properties and Distribution of (A) 

 Sulfur Dust, and (C) Vaporized Sulfur, x 75; (B) Germinating Cladosporium Spores 

 Unaffected by Sulfur Dust, x 225; (D) Effect of Vaporized Sulfur in Preventing 

 Germination of Spores, x 225; and (E) Cladosporium Spores Embedded in Dried 

 Droplets of Vaporized Sulfur, x 300. 



