SULPHUR. 



The fumes of burning sulphur are well known' as one of the 

 strongest disinfectants. In experimenting with this substance 5 

 grams were burned in the 8 cu. ft. case. This killed effectually all 

 kinds of spores and cultures of the Drop fungus in fifteen minutes ; 

 the shortest time tried. It was hoped that it might also prove effect- 

 ual in the soil, but a trial showed that as in the other cases no effect 

 whatever was produced beneath the surface. Burning sulphur very 

 freely in the greenhouse for half a day at a time failed to kill the 

 Rhizoctonia or Drop fungus in the superficial tissues of infected 

 lettuce plants, and various weeds and grasses growing in the soil 

 were only affected above the surface of the ground, moreover various 

 seeds contained in the soil showed abundant signs of life two or 

 three days later. This substance can therefore be highly recom- 

 mended for disinfecting the air, woodwork, etc., but for controlling 

 the Drop it is entirely useless. 



CARBON BISULPHID. 



The evaporation of ten cubic centimeters of this substance in the 

 case appeared to be entirely without effect upon spores in the air. It 

 was also tried in the soil by pouring small quantities into holes in 

 Drop infested earth, also with no effect. 



BRO.MIN. 



It was found that liquid Bromin evaporated in the case had con- 

 siderable fungicidal effect. Tube cultures of the Drop fungus were 

 killed by it. It showed no more power of penetrating the soil, how- 

 ever, than the other gases. 



CHLORIN. 



The same results were obtained with chlorin gas, produced by 

 combining Chlorid of Lime and Sulphuric Acid. The powerful 

 gas thus produced readily kills spores in the air and appears to be 

 among the best gaseous disinfectants, but it shows no effect beneath 

 the surface of the soil. 



From these results it appears that of these substances cyanid 

 gas, sulphur, (burning), and chlorin are very efficacious for general 

 disinfection between crops, though all are dangerous or fatal to 



