Nicotine Dust for Truck-Crop Insects. 5 
portions of the different materials are used, of which the formulas 
given below are typical: 
ForMuLA No. 1. 
Four per cent nicotine sulphate, equivalent to 1.6 per cent nicotine. 
100-pound lots. 123-pound lots. 
Beale eee se pounds... 72a akerolime tee a de ee pounds. 9 
Ebyarshed lime: = dox=_+, 24 ee yorared limess= == ee ae 0622 3 
Nicotine sulphate ______--~- do____. 4] Nicotine sulphate_______- ounces... 8 
ForMuLA No. 2. 
Five per cent nicotine sulphate, equivalent to 2 per cent nicotine. 
100-pound lots. 124-pound lots. 
Hydrated lime__________ pounds — ~ 95:|— Hydrated-lime__.______ _ - pounds__ 12 
Nicotine sulphate _____-___ do____ 5] Nicotine sulphate ___--~_- ounces__ 10 
ForMuLA No. 3. 
Six per cent nicotine sulphate, equivalent to 2.4 per cent nicotine. 
100-pound lots. 123-pound lots. 
Hydrated lime! _ == - == pounds.._ 54] Hydrated lime —-------- pounds__ 63 
Finely-ground sulphur___—_ do____ 40] Finely-ground sulphur_____ doze 5205 
Nicotine sulphate__________ dons 6 | Nicotine sulphate _______ ounces__ 12 
In the preparation of this dust it is very important that the nico- 
tine sulphate be thoroughly mixed with the carrier. This can be 
accomplished by first mixing and sifting the materials composing the 
carrier, then combining the required amount of nicotine sulphate 
with the dust, adding the nicotine slowly and mixing all thoroughly. 
The nicotine sulphate can be added to the dust by the use of any con- 
venient sprinkler. A pint fruit jar with a metal top from which the 
porcelain has been removed, punched with holes by the use of a 6- 
penny nail, makes a good sprinkler. After the addition of the nico- 
tine sulphate the mixture should be run through a fine sieve, 20 
meshes to the inch, with the aid of a brush. This last operation 
should be repeated at least three times. Be sure that all the ma- 
terial is worked through the sieve, since if this be neglected a large 
quantity of the nicotine may be lost. 
A very satisfactory and simple method of mixing the dust con- 
sists of a box (Fig. 1) with a detached cover in which a sieve is placed 
and an ordinary floor brush with a handle is attached. A slot is cut 
in the side of the box so as to allow operation of the brush with the 
cover on. The cover to a large extent prevents the escape of the 
dust during the mixing process and consequent inconvenience to the 
operator. 
The dimensions of a box in which 123 pounds of the dust can be 
conveniently mixed are as follows: Length, 15 inches; width, 10 
inches; depth, 12 inches. 
The sieve is constructed of brass screen, 20 meshes to the inch, 
tacked to a frame 4 inches deep. 
