FISH OIL AS ADHESIVE IN ARSENATE-OF-LEAD SPRAYS 13 
The spray mixture containing lead oleate did not spread over the 
spruce foliage so well as fish oil or corn oil, and but little better than 
arsenate-of-lead mixture with no special adhesive. It was applied 
on a partly cloudy day, at a temperature of 70° F. 
The spray mixture containing flour spread fairly well on the old 
growth when sprayed on spruce, but not so well on the new growth, 
being but slightly better than arsenate of lead alone. The spraying 
was done on a partly cloudy day, at a temperature of 70° F. 
The proprietary casein product was found to spread very well over 
the old growth, but over the new growth not any better than the fish 
oil, if as well. It was sprayed on a clear day, at a temperature of 
70° to 75° F. 
The arsenate-of-lead mixture without special adhesive spreads 
fairly well over the old foliage, but will not spread over the new 
growth, and only a very little of the spray will remain on it. 
For all the plots, except those on which the lead oleate was tested, 
25 pounds of powdered arsenate of lead was used to 400 gallons of 
water, and to this mixture was added the quantity of adhesive 
recorded in Table 1. As the lead oleate was a combination of lead 
oleate and lead arsenate and was in paste form, containing only 
about one-half the percentage of arsenic oxide in powdered arsenate 
of lead, 50 pounds of this material was used to 400 gallons of water. 
The spraying of the deciduous and coniferous foliage used for these 
experiments was begun June 4 and continued as rapidly as practicable 
on several dates, until on June 9 it was completed, as far as the trees 
at TTatchung Ridge and Dukes Park were concerned. On June 14 
an examination was made of the foliage which had been sprayed with 
the different mixtures, except the coniferous foliage sprayed with the 
mixture containing soap as the adhesive, and in the case of each one 
an estimate was made of the percentage remaining of the spray which 
had originally adhered. Between this date and that of the latest 
spraying all of the foliage had been subjected to rainfall of from 
1M to 13^2 inches. On June 26 a similar examination was made of 
foliage of several kinds, including that previously omitted; up to 
this time the rainfall since the last date of spraying had amounted 
to 3 inches. Similar examinations were made on July 9, August 11, 
September 17, and October 1, the total rainfall on the sprayed foliage 
at those dates being 5 3/2 to 6, 9, 15^, and 19 inches, respectively. At 
least three, and in nearly all cases four, examinations were made for 
each spraying with a given adhesive. Table 1 gives various data 
relating to the adhesives used, their application, and the results of 
the several examinations of the foliage sprayed. 
EXPERIMENTS WITH DECIDUOUS TREES IN MASSACHUSETTS 
In order to compare the results of the tests made on the Somerville, 
X. J., plots, especially those of the Watchung Ridge area, with results 
of similar tests on plots located in New England, a mixed woodland 
was selected at Saugus, Mass. Seven plots, each containing about 
an acre, were sprayed, and the same adhesives were used with the 
arsenate of lead as were used in the Watchung Ridge area, with the 
exception of the proprietary miscible oil, which was tested in a small 
plot at Melrose Highlands, Mass. Deciduous growth only was 
used in Saugus and Melrose Highlands. The adhesives were added 
