68 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
but with little variation in the general results. The sugar behaved 
very peculiarly in actually precipitating the arsenate. The Gum 
Tragacanth did not go into solution and itself settled down to the 
lower two-thirds of the cylinder. 
On Bean Foliage 
A test of the solutions on bean foliage was next made, primarily for 
burn, but incidentally it gave an indication of great promise for two 
of the materials as spreaders. Twenty-five pots of a uniform size and 
containing similar soil were planted to an excess of common navy 
beans, and placed in the greenhouse to grow. When the plants had 
attained a fair size, 10 pots were thinned down to a single uniform 
bean plant and 10 were thinned to two plants and in the following exper¬ 
iment the single plants were used in reduced sunlight, those with two 
plants were used in direct sunlight. The plants were sprayed on 
November 14 and observations on burn were made November 19, 24, 
and 29. The arsenate in all cases was used at a strength of 4.8 grams 
to 1000 cc. of solution. The materials used and final results are con¬ 
tained in the following table: 
Table II —Record of Burn 
November 19 
November 24 
November 29 
Materials 
Dilution 
Direct 
Sun 
Reduced 
Sun 
Direct 
Sun 
Reduced 
Sun 
Direct 
Sun 
Reduced 
Sun 
Remarks 
Fish oil soap. 
1-1000 
Medium burn 
Slight 
No change 
No change 
Serious 
Fair burn 
Not suitable 
Glycerine . .. 
5-1000 
Slight 
General slight 
General 
No change 
Not bad 
No change 
Questionable 
Glycerine . .. 
10-1000 
Considerable 
No burn 
Serious 
No change 
Serious 
Serious 
Not safe 
Glue. 
1-1000 
Medium burn 
Medium burn 
No change 
No change 
Fairly bad 
Not serious 
Questionable 
Gelatine .... 
1-1000 
Slight 
No burn 
No change 
No change 
Slight 
Trace 
Good 
Sage tea. 
5-1000 
No burn 
No burn 
No burn 
No change 
No burn 
No burn 
Excellent 
Sage tea.... 
10-1000 
Slight 
No burn 
Same 
No change 
Trace 
No burn 
Excellent 
Casein-lime.. 
5-1000 
Trace 
No burn 
No change 
No change 
Trace 
No burn 
Excellent 
Lime-sulphur. 
10-1000 
No burn 
No burn 
Slight 
No change 
Fair 
Slight 
Questionable 
Lime-sulphur. 
Check. 
20-1000 
Scattering 
Considerable 
Large spots 
scattering 
Small, general 
Spreading 
bad 
Spreading, 
general 
No change 
No change 
Serious 
Serious 
Fairly bad 
Considerable 
Not safe 
The two materials which gave the least burn, sage tea and the casein- 
lime mixture, likewise approximated the ideal sought for in a spreader. 
The casein-lime solution, particularly on the bean foliage, spread out 
evenly and uniformly, depositing the arsenate in a smooth, even, incon¬ 
spicuous coating. A similar test of these two materials as spreaders 
on the foliage of strawberry was made and gave most satisfactory 
results. 
Both of these materials are rather unusual and a short discussion 
of their preparation should prove of interest. 
