New YorRK AGRICULTURAL EXPERIMENT STATION. 303 
the gas was allowed to act for several hours, the excess of water 
being essential to prevent crystallization of by-product. 
The following tables show tests made in orchard fumigation 
under box fumigators, hence should show approximately the 
amounts of acid and water to be used to give most uniform 
results within shortest period of time under varying field con- 
ditions. 
The potassium cyanide used was what is known by dealers as 
“broken cyanide 98 per ct. pure” and unless so stated no addi- 
tional labor or cost was expended in order to have it of a definite 
size. Except where indicated, chemically pure sulphuric acid 
(98 per ct., sp. gr. by test 1.84) was used. 
TABLE IX.—TESTS WITH VARIOUS FORMULAS FOR FUMIGATION. 
FORMULA 1-1-2, 
Time of Time of 
treat- chem. 
KCN. H,SO,. H,O. ment. action. Results. 
Ozs. Fl. ozs. Fl. ozs. Min. Min. 
PO 7.0 14.0 35.0 11.0 KCN in _ two pieces. By-product 
crystallized in 30 min. Temp. 58.5. 
c.0 7.0 14.0 35.0 10.0 KCN in _ two _ pieces. By-product 
erystallized, commercial sulphuric 
acid. 
7.0 7.0 14.0 30.0 17.0 KCN in _ one piece. By-product 
crystallized, commercial sulphuric 
acid. 
7.0 7.0 14.0 35.0 11.0 KCN in two pieces, one large, one 
small. Temp. 45°. 
7.0 7.0 14.0 30.0 5.5 KCN powdered. Temp. 45°. 
FORMULA 1-1-3. 
4.0 4.0 12.0 30.0 * Chem. action not complete, com. acid. 
6.0 GOs Lo Ol yaosd Chem. action not complete, com. acid. 
8.0 So Oe aa oe. O Chem. action not complete, com. acid. 
Lowe a lo.0." 45.0° 35.0 Chem. action not complete, com. acid. 
some large pieces of KON. 
6.5 6.5 19.5 30.0 Chem. action not complete, com. acid. 
Bio) bl. 21 o0.0) 3) Chem. action not complete, com. acid. 
some large pieces of KCN. 
4.5 4.5 14.0 30.0 Chem. action complete, com. acid. 
4.5 AD LAS Ome BOs) Chem. action complete, com. acid. 
1.0 7.0 21.0 35.0 11.5 Chem. action complete, one piece KON. 
fez, 21.525 35.0) 60.0 Chem. action complete, com. acid, 
FORMULA 1-1144-3%4. 
11.25 18.0 39.0 380.0 8.0 KCN in two pieces. Com. acid. 

* In cases where time of chemical action is not given, the tests were made under tents where 
the action could not be observed, 
