8 MISC. PUBLICATION 318, U. 8. DEPT. OF AGRICULTURE 
MAKE KILLING JARS 
Fourth meeting—May 
Equipment: 
A 1-pint fruit jar fitted with jar ring and tight lid. 
Piece of cardboard (double-faced corrugated preferred). 
. Small bottle of carbon tetrachloride. (Carbon tetrachloride cleaning 
fluids may be used.) 
About a half cupful of small scraps of rubber from any source, such as 
old jar rings or inner tubes. 
Procedure: 
1. Cut cardboard to fit tightly inside jar. 
2. Place scraps of rubber inside jar. 
C2 ND 
sa 
( 
(0 
FIGURE 14.—Glass jar with F3rctre 15.—Jar charged with Ficure 16.—Killing jar prop- 
tight lid. carbon tetrachloride. erly labeled. 
Saturate scraps of rubber with carbon tetrachloride. 
Pour out excess liquid after rubber becomes saturated. 
Cover scraps with cardboard disk. 
. Place lid on tight. 
If jar is kept sealed tight except when insects are being placed in it or removed 
from it, the carbon tetrachloride will remain active for a month or more. 
To recharge killing jar, remove the cardboard and add more carbon tetra- 
chloride as explained in item 3 of procedure, above. Replace the cardboard disk 
and the lid. 
> OU He oe 
PIN INSECTS 
Equipment: 
1. Pins (No. 3 insect pins preferred; common pins may be used). 
2. A few freshly killed insects representing each of the five major groups; 
namely, stinkbug, beetle, bee or fly, grasshopper, butterfiy. 
3. Spreading board. 
4. Labels to be placed on pin with insect. 
Becwie Bee Grasshopper 
FIGURE 17.—Insects, properly pinned. 
Procedure: 
1. Pin insects according to figure 17, above. 
2. Place on pin, label giving name of insect, name of collector, date when 
collected, and place. 
a. Instructions: See sixth meeting, calendar of activities, first year, 
; 
