New York AGRICULTURAL EXPERIMENT STATION. 341 
It is convenient to have a box which will hold about 50 cubic 
feet for use in fumigating very small lots of nursery stock, bud 
sticks, scions, etc.; then the chemicals can be used at one-half 
the strength given for 100 cubic feet. A very convenient form 
has the inside dimensions 2 ft.x 3 ft.x 8 ft. It is long enough 
to hold ordinary sizes of nursery trees. It may be made air 
tight by using building paper and matched boards after the 
manner just described for the fumigating house. It should have 
an opening low down on one side through which the cyanide 
may be dropped into the acid after the top of the box has been 
tightly closed. This opening should be closed by a tight fitting 
slide as soon as the cyanide has been put into the acid. 
Some fumigating houses are made large enough so that a 
wagon loaded with nursery stock can be run into the fumigating 
room. Where this plan is followed the floor of the wagon box 
or rack should be open enough to allow the gas to pass readily 
to the lowest part of the load. The fumigation requires no less 
amounts of the chemicals when there are not enough trees to fill 
the room. In such a house as this the cost of filling the empty 
Space with gas is so great that some nurserymen believe it is 
more economical to unload the wagon and fill the room with 
stock, leaving the wagon outside. | 
ACKNOWLEDGMENTS. . 
The writer desires to acknowledge with thanks the courtesies 
extended to him and assistance rendered in the preparation of 
this bulletin by Mr. F. A. Sirrine, Entomologist for this Station 
at Jamaica, N. Y. ; Mr. E. B. Hart, Assistant Chemist, Geneva, 
N. Y.; Professor W. G. Johnson, Entomologist of the Maryland 
Agricultural Experiment Station, and Mr. C. L. Marlatt, First 
Assistant in the Division of Entomology, Washington, D. C. 
