EXPERIMENTS WITH INSECTICIDES AND FUNGICIDES. I43 



was intended for this experiment was not used because of the 

 number of missing hills. A field was finally selected on which 

 the stand was fairly uniform. The land had been uniformly 

 manured the preceding year and had grown potatoes and the 

 yield of 1901 was fairly uniform over the whole field, being 

 somewhat smaller on the north side, the yield gradually 

 increasing to the south. Eight rows running across the field, 

 so as to include nearly one-half acre, were selected for each plot. 

 At harvest the two outer rows of each plot were rejected and 

 14 rods of the west end of 6 rows were used for the comparative 

 yields. The potatoes from these pieces were assorted and 

 weighed in the field. All of the details of the experiment were 

 under the personal supervision of the director or Mr. Bartlett, 

 chemist to the Station. Twice at the time of taking notes repre- 

 sentatives of the Danforth Chemical Company and of the Merri- 

 mac Chemical Company were present and their judgment agreed 

 with the notes taken. 



The amounts of Bug Death used per acre were those sug- 

 gested by Mr. Merrill, the superintendent of the Danforth 

 Chemical Company. The field was sprayed five times, July 12, 

 July 19, July 26, August 2, and August 27. Bordeaux mixture 

 was used at each application at the rate of a barrel to the acre. 

 The Paris green and arsenate of lead were used only in the four 

 first applications. Bug Death, at the request of Mr. Merrill, 

 was used in all five applications. The arrangement of plots and 

 yields are given in the table on page 145. The rows ran east 

 and west, plot one being on the north side. 



FIELD NOTES. 



Plots were all sprayed July 12. 



July 15 there were very few eggs on the pieces and no slugs had hatched. 

 The plants had formed two or three leaves since they were sprayed 

 the 12th. 



July 19 plots all sprayed. 



July 22 slugs just beginning to hatch and practically no slugs of any 

 size on the entire field. The notes for the individual plots were practically 

 all alike. Occasional plants over the piece had a few newly hatched 

 slugs on the terminal leaves. 



July 26, all plots sprayed. 



July 27. Plot 1. Few small slugs on occasional plants. Plot 2. Quite 

 free from bugs, but rather more than on plot 1. Practically no large 

 slugs. Plot 3. Rather more slugs than on plot 2, particularly on the south 



