-45 
The samples to be tested were taken in four series—the first from the 
strongest application, the second from the weakest, and the third to 
serve as a check, from untreated soil, while the fourth was taken from 
the special 4-pound application previously mentioned. Each series was 
composed of three samples, the first being taken at the surface, the 
second from a depth of 4 or 5 inches, and the third from a depth of 
from 10 to 12 inches from the surface. The tests were made by Mr. L. M. 
Bloomfield, assistant chemist of the Ohio Agricultural Experiment 
Station. : 
Of each sample 500 grams was digested in 1,000 cubie centimeters of 
distilled water for twenty-four hours, and in 50 cubic centimeters of the 
filtrate, equal to 25 grams of soil. The chlorine was determined volu- 
metrically by a solution of silver nitrate, 1 cubic centimeter of which 
was equal to 0.003546 gram of chlorine. The result of these tests is 
shown in the following table: 
C. C. of AG. 
Series. Weight of kainit. Sample. No. 3. 
| 1 4.00 
Li COR Su QUT Gee nao eet cari. cate Sep aCe AS ae 2 5. 00 
3 6.5 
1 act 
Be ee eee AGT TTC): BAe oe Boe JEE SO a ie SC On ea tee aie ae ae ‘ 2 L3 
3 1.2 
1 0.3 
USE Stee CREORS sore son ae as rt a 2 Seen eee ewan cea staweased aa sncn2 ‘ 2 0.5 
0.2 
( 1 8.2 
2) See PP REMIGM IT en Soot ee Mave Panis oss oN x Sos so mace seatee 2 9.5 
3 ee Re | 
These tests show that while there was a slight trace of chlorine in 
the check soil the treated samples tested very much higher. the 
strength increasing with the depth from which it was taken in the 
vineyard, except in case of the weakest; so that none of the larve 
observed, which in all cases were found above and not below sample 
No. 3, could have escaped whatever action the kainit might have had 
as it penetrated the soil. 
These experiments and tests clearly show that the kainit will pene- 
trate the soil to a depth sufficient for all practical purposes, but thatit 
can hardly be made strong enough to be effectual against this pest, 
and, besides, it passes far beyond the limit of practicability in point of 
expense at the maximum strength given in the foregoing. 
In discussing this paper Mr. Howard called attention to the great 
interest attaching to the negative results from experiments with kainit. 
These results were entirely contradictory to those obtained by other 
experimenters, and indicated the need of having the subjeet gone over 
thoroughly and exhaustively. 
Mr. Hart spoke brietly concerning an experience in destroying potato 
