April, 5 24] 
SASSCER & WEIGEL: GREENHOUSE FUMIGATION 
217 
house tests to determine what strength of gas a wide range of plants 
would tolerate. 
These tests, the results of which are presented in Table I, were con- 
/9/V/p /y/E~THO& oe httt?ch/a/g ehchhgeo h/ett je/th eehte beoheh ewby. 
'SB.VB. C/BT/2HT/A/G THE OEE/SHT/OH OE THE OEH/CE. 
Fig. 4.—Device for dropping cyanide into generators simultaneously. 
Fig. 5.—Device for opening ventilators from outside. 
ducted during April, May and June 1923, in a 200 cubic foot fumigating 
box. Twenty cubic centimeters of the liquid hydrocyanic acid testing 
