BOLL WEEVIL CONTROL BY USE OF POISON. 20 
The gun should hang naturally so that the nozzle is directed at the 
tops of the cotton plants without causing any undue strain on the 
operator in aiming it. 
The capacity of the feeding mechanism should be sufficient to per- 
mit the use of a delivery of at least 1 pound in 5 minutes at the 
ordinary rate of cranking. 
The feed should be quickly and positively controlled. Adequate 
facilities should be provided for lubrication of working parts. 
The fan should create sufficient air current to break up the dust 
into a.cloud and force it to spread over ali parts of the plant. 
The gun should be well constructed throughout so that breakage is 
reduced to a minimum. 
All parts of the gun should be as conveniently accessible as possible 
for repair or replacement. 
WHEEL-TRACTION OR CART DUSTER. 
The wheel-traction machine should be light enough in weight and 
draught to enable an average team to operate it through a full night 
without undue fatigue. 
There should be sufficient axle clearance to mee plant injury. 
The tread should be such that it will straddle a row of cotton 
without running on the adjacent ones and still prevent the machine 
from being dangerously top-heavy. 
The machine should be properly balanced on the axle to prevent 
uptilting of the tongue or undue strain on the necks of the team. 
All details of construction should be simple, fool-proof, and dur- 
able. 
The feed mechanism should be subject to quick and positive regu- 
lation, varying from a complete cut-off to a maximum delivery of 
6 seine in 5 minutes through the three nozzles at the ordinary rate’ 
of walking for the team. 
The fan should create sufficient air blast to prevent clogging of the 
pipes, and to blow the dust throughout the plants under any ordinary 
weather condition. 
The machine should be provided with suitable hghting equipment. 
The hopper capacity should be sufficient to hold from 30 to 50 
pounds of calcium arsenate. 
The distributing system should be provided with a positive lift to 
regulate the height of the nozzles from vertical to horizontal and 
should also be arranged to fold in conveniently to permit passage 
through gates. 
The platform should be large enough to accommodate all ma- 
chinery and the driver and also to carry a barrel of poison. 
