994 I. M. Haw ey 
Liquid-contact materials also were tested in 1918, as shown in table 10. 
While the slug was crawling on the ground it was sprayed with the liquid 
from an atomizer, and was then left under natural conditions. 
TABLE 10. Liquip-Contact Sprays TRIED AGAINST AGRIOLIMAX AGRESTIS 
Material applied Effect on slugs 
Black-leaf-40 (1--400), soap (4-50)..............0..0..000000. Killed slowly but surely 
Limewater (2-per-cent solution)....................0..00005. Killed 
Chloride of lime (2-per-cent solution)........................ Kialled quickly 
Kerosene emulsion (10 per cent)...............00 000-0000. Not killed 
Kresco sheep dip (10 per cent)...........0.00..00 0.00 eve eee. Killed 
Carbolrezemiulsiony C20) yey ie tea, eles eclasgeny pt arsenide | Veena Killed 
Copper sulfate solution (5 per cent)............0..0 20.02.05 Killed slowly 
* 
In the experiments summarized in table 10, ten large slugs were used 
to test each material. The Black-leaf-40 was fatal every time, but it 
often required several hours to kill the slug. The limewater, the chloride 
of lime, and the carbolic emulsion proved fatal in thirty minutes. The 
copper sulfate seemed to work much more slowly than in the former tests. 
In 1918, during an outbreak at Charlotte, New York, a poison bait 
composed of one quart of chopped clover, one teaspoonful of arsenate of 
lead, and one tablespoonful of molasses, was tested. The slugs showed no 
preference for this bait, and several specimens that were placed where 
the bait was the only food available, and thus forced to eat it, were not 
killed. 
In July, 1920, the writer was able to find a sufficient number of slugs to 
enable him to conduct a small series of laboratory tests. The result of 
these are given in table 11. 
In the experiments of 1920, recorded in table 11, both full-grown and 
immature slugs were used. It was noted that the larger individuals often 
revived from doses that proved fatal to the smaller specimens. Control 
materials in dust form seemed to give much better results at this time than 
did the same material applied as a liquid. In previous experiments sprays 
have sometimes seemed to give as favorable results as the dusts. There is 
apparently some varying factor that enters to either help or hinder the 
killing power of some of these materials. It is possible that the relative 
humidity may have some influence. Black-leaf-40, which had shown good 
killing power in the previous experiments, seemed to act very slowly even 
at the increased strength that was used. Carbolic-acid emulsion gave 
satisfactory results, and when applied to bean foliage it caused no injury 
under the prevailing conditions. The best results at this time came from 
