21 
the Iowa Experiment Station. A strawberry patch infested with the 
green strawberry slug (Monostegia ignota Cr.) was thoroughly sprayed 
with London purple (one pound to 200 gallons of water), and within a 
week after this application Mr. H. A. Gossard and other employes of 
the station u ate very heartily of the ripened fruit" without experienc- 
ing any ill effects whatever. This matter is fully discussed in Bulletin 
No. 18 of the Iowa station, and in Entomological Xeics (vol. in. p. 
230), and the general subject of the danger of poisoning from the con- 
sumption of fruit and vegetables sprayed with arsenicals is considered 
in Farmer's Bulletin Xo. 19 of this Department. 
In accordance with my suggestions, Mr. B. E. Behrend made some 
experiments with the kerosene emulsion and. at his own instance, with 
Paris green, and kindly reported results. 
Experiments with Kerosene Emulsion and Paris Green. — The kerosene- 
soap emulsion, diluted with 10 parts of water, was sprayed on the vines 
May 5 and G (1893), an ordinary spraying syringe being used for the 
purpose. May 8, when I visited the field, a few beetles were still on 
these vines, but the difference in their numbers and of those that were 
at work on the check plats was quite x^erceptible. The application was 
made too late to be of substantial value, but it served to show that the 
emulsion was of some value as a repellaut. 
The present year work was begun earlier, and with better success. 
The held treated was divided into five parts. 
Plats 1 and 2 were of the " Charles Downing" variety, of equal size, 
and contained about the same number of plants. Plat 1 was sprayed 
with Paris green April 26 and 29, May 3 and 6. Plat 2 was treated 
with kerosene emulsion April 29 (threatening and rainy weather pre- 
venting earlier spraying), May 3 and 6. As a result, double the num- 
ber of berries were picked from plat 1 as from plat 2. 
Plats 3 and 1 of the " Sharpless w variety were treated in a similar 
manner to 1 and 2, but the presence of blight prevented an exact esti- 
mate of the result. Plat 5. or half of the entire field, of "Charles 
Downing"' variety, was treated with Paris green, with the result that 
only a few buds were found to have been cut ! 
Mr. Behrend also reported that a neighbor of his applied Bordeaux 
mixture with some success. 
It should be said that while the above experiments were of value in 
showing the efficacy of Paris green and its superiority to kerosene emul- 
sion, still the fact that the emulsion was not applied until three days 
later than the Paris green must be taken into consideration, as this 
undoubtedly affected the result. 
Directions for the Application of these Insecticides. — The following sug- 
gestions are substantially as given to our correspondents during the 
past two years. To obtain the best results it is necessary to spray the 
vines a day or two before blooming, and again two or three days after 
first bloom, at least three applications being made at intervals, the dif- 
ferent applications being graded with a view to keeping the plants 
