8 
BULLETIN 1439, U. S. DEPARTMENT OF AGRICULTURE 
The soap used in this series of tests was a semisolid sodium soap 
used in washing automobiles. It was mixed with a small quantity 
of water and added to the contents of the spray tank. Arsenate-of- 
lead mixtures containing this material spread well, entirely covering 
Fig. 3.— Appearance of foliage in plot at Watchung Ridge, sprayed with mixture containing 
soap as adhesive. A, foliage shortly after application of spray, June 4, 1924; B, foliage on Septem- 
ber 17, 1924 
the surface of all kinds of foliage. The spraying for testing this ad- 
hesive was done on a partlv cloudy day at a temperature of 60° to 
65° F. (fig. 3). 
Fig. 4.— Appearance of foliage in plot at Watchung Ridge, sprayed with mixture containing corn 
oil as adhesive. A, foliage shortly after application of spray, June 4, 1924; B, foliage on September 
17, 1924 
* 
The corn oil, owing to excellent agitation, mixed immediately with 
the arsenate-of-lead mixture. The spraying was done on a partly 
cloudy day with a light wind; the temperature was from 65° to 
70° F. The spray spread fairly well over all kinds of foliage, but not 
so well as did the soap mixture (fig. 4). 
