Potato Culture in Colorado 
formaldehyde solution is poured over it. The operator must leave 
the cellar immediately and close it up tightly to escape the fumes. 
If the cellar is large and requires large quantities of chemicals, 
several vessels or dishes should be used, placing them in different 
portions of the cellar so that the fumigation may be more uni¬ 
form. The cellar should be left closed for 48 hours, or longer. 
