46 MASS. EXPERIMENT STATION BULLETIN 183. 



8. Sterilize the bench soil by one of these two methods. If formalde- 

 hj'de is used, apply at the rate of 2 gallons per cubic foot. If boiling 

 water is used, apply until every part of the soil is heated above 50° C. 



9. Use a different set of tools in the clean house, or sterilize all tools 

 before bringing them in. 



10. Keep the walks in all houses covered with lime. 



LITERATURE CITED. 



Morgan, A. P., 1892. "Two New Genera of Hj-phomycetes." Bot. Gaz. 17: 

 190-192. 



Ellis, J. B., and Everhart, B. M., 1900. "New Species of Fungi from Various 

 Localities, with Notes on Some Published Species." Bui. Tor. Bot. Club 27: 

 49-64. 



Massey, L. M., 1917. "The Crown Canker Disease of the Rose." Phytopathol- 

 ogy 7: 408-417. 



