New York Agricultural Experiment Station. 339 



FoRMUi-A FOR Immature Stock, Bud Sticks, etc. 



Potassium cyanide, 88 to 99;^ pure % oz. (avoir.) 



Sulphuric acid % fl. oz. 



Water 21/2 fl. oz. 



REFUMIGATION. 



Johnson finds that the peach will not stand a second fumiga- 

 tion. Apple, pear, etc., are not injured by it, but it is well not 

 to expose stock a second time to the gas after it has been once 

 properly fumigated. 



FUMIGATION OF STOCK NOT DORMANT. 



Stock which has passed out of the dormant condition cannot 

 be safely fumigated with gas at the strength given for dormant 

 stock, neither can it in the fall before the leaves have dropped. 



THE FUMIGATION HOUSE. 



The first essential in building a room or box to be used in the 

 fumigation of nursery stock is to make it air tight. If the room 

 is not air tight the results will be uncertain and surely unsatis- 

 factory. 



It is also important that the room or house be so located that 

 it can be readily ventilated without having the escaping gas 

 interfere with other work. It is best to provide for ventilation 

 by flues opening through the roof. This is especially desirable 

 where the fumigation chamber occupies a portion of a packing 

 shed or any other building which is filled with workmen during . 

 the fumigating season. 



Figures 10 and 11 give different views of a very satisfactory 

 fumigating house used by the R. G. Chase Nursery Co., Geneva, 

 N. Y. It is modeled after the house described in Bulletin 57, 

 Maryland Agricultural Experiment Station, pages 92 and 93. A 

 somewhat detailed description of it is herewith given because it 

 represents a very good type of air tight construction. 



The outside dimensions of the building are 16 ft. x 32 ft.; 

 posts 7 ft. and peak of roof 9 ft. high. The studding, which 

 is 2x4 inch hemlock, is covered outside with building paper lapped 



