45 
noticed forty-eight hours after application feeding as usual though 
themselves and the leaves were coated with powder. In breeding cages 
better results were obtained. Light applications did but little good as 
outside, but heavy applications, where plants were completely covered 
with powder, were quite effective, both species being destroyed to the 
extent of SO per cent, to 90 per cent. (No substance was more carefully 
or thoroughly used than this in the above experiments.) In solutions 
the effect was about the same. It was used up to 8 ounces to 1 pint of 
water, making almost a thick mixture. In this manner about 25 per 
cent, of rapce were killed in the field; not tried in cages. 
All of my work points to the conclusion that brassicce is more diffi- 
cult to deal with than rapce; especially is this true where the poisou is 
a powder to be eaten. They are easily disturbed and will move away 
to the under side of the leaves until disturbing cause has disappeared. 
This powder cannot be successfully applied with a bellows, because 
of its characteristic of accumulating in little balls or masses which can- 
not pass the bellows, and, also, it must be applied heavily to accomplish 
any results whatever. Heavy applications by hand will probably prove 
the only means of doing any good with it. 
TOBACCO SOAPS. 
Of these several were used, Wolf’s Vermin Soap and different brands 
from the Rose Manufacturing Company, of New York, known as sulfo- 
tobacco soaps. Also two brands made by the above company were 
sent me by the Division, viz, a soda and a potash tobacco soap. These 
two packages seem not to be the same grade of goods the company at 
present manufacture, as evidenced by the difference in strength shown 
by my tests. The samples sent by the Rose Company were a plain 
and scented soda soap and a scented potash soap. The sample of Wolt’s 
soap was received from the Milwaukee Soap Company, Milwaukee, Wis. 
It is a stiff soda soap strongly scented with tobacco and very offensive 
to handle. The potash soaps above mentioned were much softer than 
the soda soaps. They all dissolved readily at 100° Fall., and the Rose 
soaps remained in solution, but the Wolf’s soap solidifies the whole so- 
lution even when very weak, forming a jelly-like mass. This is a very 
objectionable point if this soap is desired to be used as spray, as it 
necessitates heating every time before using. 
On Cabbage Worms. 
The two samples received from the Division were thoroughly tested 
on both species previously mentioned in this report. The solutions 
were made of different strengths up to 4 ounces to l pint of water, at 
which strength the soda soap destroyed slowly but thoroughly all larvra 
of both species, and the potasli soap was sure death to all larvra which 
came in contact with it. These solutions improved with age as did all 
the soap solutions. 
