62 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
3. Scott & Siegler. 1915. Misc. Insecticide Investigations, U.S.D.A. 'Bui. 278> 
p. 47. 
4. Lovett & Robinson. 1917. Toxic Values and Killing Efficiency of the Arse¬ 
nates. Jour. Agric. Research, X, No. 4, p. 199. 
5. DeSellem, F. E. 1916. Calcium Arsenate. Ann. Rept. Hort. Dept., 1916, 
Yakima Co., Wn., p. 45. 
President R. A. Cooley: This interesting paper is before you for 
discussion. Studies of the effectiveness, burning qualities and cost of 
arsenicals are important, and it is evident that much is left which we 
might desire in our knowledge of these matters. In Montana, a 
plant pathologist has for years been studying effects of arsenicals 
mainly on the apple and has shown, as was published in the Journal 
of Agricultural Research, in his experiment that white arsenic was 
remarkably non-injurious to the foliage of the apple when sprayed 
on the trees. Following this, we recently attempted to use white 
arsenic in spraying potatoes, receiving no injury whatever on the 
potatoes, when amounts comparable to the amount of arsenic in Paris 
green were used, and surprisingly not killing the potato beetle, Leptin - 
otarsa 10-lineata. We have evidently some things yet to learn about 
arsenicals. 
The next paper is “The Influence of Molasses on the Adhesion of 
Arsenate of Lead,” by Mr. Hartzell, of New York. 
THE INFLUENCE OF MOLASSES ON THE ADHESIVENESS 
OF ARSENATE OF LEAD 
By F. Z. Hartzell, Vineyard Laboratory, New York Agricultural Experiment 
Station, Fredonia, N. Y. 
The use of molasses in spraying mixtures, for various reasons, has 
been recommended by certain workers in plant pathology and ento¬ 
mology. During the period from 1910 to 1916 the writer used molasses 
to make arsenate of lead more attractive to the Rose Chafer ( Macro - 
dactylus suhspinosus ) and the grape root-worm ( Fidia viticida). The 
success that attended these earlier experiments we believe to have 
been due to the lack of rain in the period immediately following the 
application of the material. During 1912, the observations in vine¬ 
yards sprayed with this combination indicated that failures to secure 
favorable results against the grape root-worm that season were 
related to the number of days intervening between the time of spray¬ 
ing and the first rain; i. e., the shorter the time the less perfect the con¬ 
trol of the insect. This in turn suggested that the adhesiveness of 
