BAIT AND LIGHT TRAPS 
317 
according to the height of the cotton, and is preferably set so low as 
to strike the tops of tbe plants. By clamp screws tbe pan-lamps are 
attached to this bar. The runners are thought to do less injury than 
wheels would to the crop, and are placed so far apart as to straddle 
two rows or more. Different kinds of traps or torches, as inflammable 
balls, may be ns d ou the frame if desired. 
Bait Traps. — These traps appeal to the sense 1 of smell as associated 
with that of taste. 
The Heard Bait Trap. — This device was patented by Mr. J. If. Heard 
in L8G0, and is illustrated in Plate LX1, Fig. 4, which gives a section 
view. The circular pan, A. contains the bait, B, mixed with adhesive 
substance to attract and drown the moths. A partial cover, <i. with a 
widely open center and forming a ledge, a. projecting horizontally in 
wards from the upper edge of the pan a short space above the liquid 
bait prevents the moths from getting at the bait without falling in, and 
then helpfl to stop their escaping. The inverted cone, 0, and circular 
umbrella or rim, 1>, are lor the moths to strike upon and to deflect 
or knock them down into the bait, which is made as follows: To a little 
anise, fennel, or other essential oil, add a little alcohol, and afterwards 
mix with this a gallon of molasses for each ounce of the oil used. A 
fresh mixture of the bait should be introduced once a week. According 
to the Agricultural Department Report on Cotton Insects, 1ST!), this 
trap has been "quite extensively used" in the South. 
The (iarrett Ilait 'Trap. — Made by Mr. J. G. (1. Garrett, Of Port Gib- 
son. Miss., is shown in plan section in Fie;. 2, PI. LXI. Upon the stake, 
$, is mounted a tray, /, containing the bait, .r, and bearing a horizontal, 
inward-projecting edge, e, of sheet metal about three-fourths of an inch 
wide, and situated a short distance above the bait, .r, to cause tin 1 moths 
approaching the bait to fall in and then prevent their escape. In the 
center is a support, for a light and having also a horizontal ledge. 
Mr. Garrett does not recommend the use of the light and has much bet- 
ter success with bait alone, so the former may be omitted. Above the 
whole is a roof, r, under the eaves of which, and at its ends, is space for 
the moths +o enter. This will help prevent their escape and protect the 
bait from being affected by rains* The bait consists of about equal 
quantities of molasses and water, with a little vinegar or other attractive 
substances. Occasionally the insects may be strained out from the bait, 
which is then used again. Mr. Garrett's older lamp-trap, noticed below, 
is now abandoned for this one which has some preference. 
Traps combining light and bait. — Traps may be made to combine 
the best features of both the preceding kinds and the two different at- 
tractives, bait and light, may be used simultaneously or in alternation. 
Where the bait is used at night associated with a light, the former may 
help some in drawing the insect to the latter, but when the light is 
once closely approached its dazing effect on the insect probably produces 
the entire effect which follows. The bait may be used independently in 
the daytime and the light with it or independently at night. 
