TESTS OF MACHINERY FOR KILLING COTTON WORMS. 47 
supports the hung-pipe and slides in eyes situated diagonally with re- 
ference to the hung-pipe. In the second, the pipe-top is supplied by a 
flexile piece of hose, and is supported by a long slide-rod on one or 
two of its sides, and inserted through loose eyes placed diagonally from 
the course of traction, asin the foregoing case. In the third instance, 
the top is similarly supplied by a hose, but is hung by a peculiar locked 
hook, eye, or loop which glides loosely on a stiffly-set diagonal bar. The 
simple wooden A-frame answers, and a series of small sloping metal bars 
of gas-pipe were arranged on a wooden cross-bar. This device worked 
well. Many kinds of winders would apply, but asimple plan is to wind 
the small rope or cord around a pair of large eye-screws placed 3 inches. 
apart. The set line can be attached at any point along the sliding 
parts. Behind the proximal end of the range, through which any 
pipe-top is to be allowed to slide, the line may pass through a large 
screw-eye and thence to an extension of the pipe-top above the axis on 
which it is hung. Then the pipe may be drawn to this place, and by an 
extra pull its top will be brought down to the eye and the lower parts 
of the pipe will be tilted upward above the plants for turning, when this 
feature is desired. 
Concerning the use of kerosene upon cotton, the following should be 
stated: About 10 gallons were applied, half undiluted and half in 
emulsion variously diluted. The undiluted petroleum destroyed about 
10 per cent. of the foilage sprayed by it. The undiluted milk-kerosene 
emulsion ruined only about 2 per cent., and this diluted injures less and 
less according to the attenuation, but all treated was injured to at least 
a slight extent. The sprays were hardly satisfactory, as the tubing 
would not permit the high pressure necessary for a very fine mist, and 
the indications are that with the finest spray the strong kerosene and its 
slightly diluted preparations may possibly yet become used, in proper 
hands with great caution, upon the crop, but additional experimental 
tests are needed. 
The apparatus taken, with the different machines constructed at Selma 
and overcoming the objections herein set forth, have been shipped to the 
Department. 
The leading conclusions from the experiments upon the special points 
in my instructions may be extracted from the above and briefly sum- 
marized as follows: 
At Selma, I operated the machine taken from the Department and 
tested the points in question, so far as circumstances permitted. The 
distinctive feature of the machine, its stiff supporting pipes, unfitted it 
for the work to be accomplished. As fields could not be found having 
rows practically of the same regular width as the spaces at which the 
downward pipes were held stiff by their supporting pipe, that permitted 
no independent lateral adjustment of the tops of the hanging pipes with 
reference to each other or to the rows having different or varying widths, 
this vital impediment at the outset frustrated its use and the obtain- 
