i66 



Bulletin 155. 



in proportion to the size of the box, the above mentioned amounts 

 being used for every hundred cubic feet of contents. The sul- 

 furic acid should be put in the vessel, the water added, and last 

 of all the cyanide is dropped in. If the latter is carried in a 

 paper bag, the bag may also be dropped into the diluted sulfuric 

 acid, and in this way the danger of handling is somew^hat 

 reduced. As soon as the cyanide is put in the acid, the box 

 should be quickly closed and the stock allow^ed to remain at least 

 thirty minutes. 



8. Funiigatitig house. Adapted from Johnson. 



When large amounts of nursery stock are to be fumigated, a 

 small building specially constructed for the purpose will be more 

 satisfactory. Such buildings are in common use in Maryland, 

 where all stock handled by nurserymen is required by law to be 



given the gas treatment. 



Afumigatmg house. — A building similar to the one in question is illus- 

 trated by Johnson and described as follows : " It is 32x16x8 feet with a roof 

 pitch of two feet, and is divided into two rooms about 15x14x7 feet and two 

 smaller rooms 4x5x7 feet constructed as follows : 



" First, a good substantial frame is built which is covered outside with 

 iX inch 12 inch Virginia pine boards, and >^x4inch batting. The interior 

 is first lined with two-ph^ cyclone paper and then with 4 inch flooring. 

 The partitions and floors are also double with paper between. The roof is 

 covered with heav}' roofing paper, tarred and graveled. The doors are 6>^ 

 X3 feet (3'/^ would be better), made double, refrigerater style, and hung 

 with three heavy strap-iron hinges, and held in place when closed with two 



