280 KEPORT 4, UNITED STATES ENTOMO LOGICAL COMMISSION. 
ble resistance to the fluid forced through it. In the figure the tubular 
arms, i i, are joined to the angle-piece by the flexile sheath couplings, 
e e, having stout wraps. To prevent the joint thus formed from being 
too flexile, and to give it additional elasticity, a rod of spring metal 
extends inside. These spring rods cause the arms to spring to the 
sides of the cotton plants and the fork to swing or close as pressed 
upon by the row or not, and thereby conform the positions of their ter- 
minal nozzles, n n, to the variable width or courses of the rows, to apply 
the same to discharge diagonally, or from the center of each plant, up- 
ward into its foliage. 
The nozzles may be joined inflexibly or by an elastic union with sheath 
and spring rod, or in any of the flexile parts named spring-lined suction- 
hose or a torsion spring, to allow partial but not complete rotary move- 
ment, may be employed. Each terminal arm forms a supply tube to its 
nozzle chamber, which has an eccentric inlet-passage, from the same 
tangentially through its wall, admitting the fluid so eccentrically that 
it whirls in the chamber and discharges through a side outlet in the 
form of a spray. The whirl thus produced is very intense and gives the 
fluid such centrifugal motion as will disperse it broadly from the orifice 
and thus produce a very finely atomized spray. The spraying power 
Taries with certain details in the proportions and construction of the 
passages and other parts. With a suitable straining device in the base 
•of the pump, bodies large enough to clog the small outlet cannot enter, 
but, should clogging material^ enter otherwise to interfere with the 
•discharge, the face and back of the chamber may be easily taken apart 
to remove matters from the interior. The nozzles project so little be- 
yond the supply-pipe as hardly to catch upon the plants, and in case 
••any objection be raised to the slight recess sometimes occurring between 
the chamber and its pipe, that may be filled completely by metal. This 
-same nozzle is used with equally good effect on other pipes, hydronettes, 
syringes, or pumps, as well as on blast atomizers, and is unsurpassed 
for spraying diagonally or upward, as here desired. 
The final peculiarities of the nozzles "and distributing parts of the 
machine just described have been attained in the course of extended 
•experimentation in my work under Professor Riley, and I have com- 
bined them with each other, with various forcing media, and with means 
of support and conveyance in some of the ways which seemed to me 
practical. Before noticing other examples of their application it will 
be well to consider their internal anatomy more carefully here. For 
this purpose attention may be directed to Plate XLIX, Figs. 2 to 7. 
Plate XXXIX, Fig. 4, illustrates the form of fork used in the compound 
machines represented in the plates cited, while Plate LXIX, Figs. 2 to 
7 present several modifications of the fork and its parts as planned and 
tested by myself. 
Referring to the figures cited the parts may be explained as follows : 
h is the coupling or segment of hose or other suitable material, and t is 
