90 
IV. The amount of copper found at the harvest on fruit treated with 
Bordeaux mixture. 
The vineyard was divided into fi ve plats as shown in the accompany¬ 
ing diagram. 
I 
V 
III 
UNTREATED. 
i 
II 
T V 
Plat i, consisting of 203 vines, was treated with Bordeaux mixture, 
formula b. 
Plat II, of 221 vines, treated with ammoniacal solution of copper car¬ 
bonate. 
Plat III, 1G7 vines, treated with copper carbonate in suspension, 3 
ounces to 22 gallons of water. 
Plat IV, 183 vines, treated three times with Bordeaux mixture, fol¬ 
lowed by five applications of the ammoniacal copper carbonate solu¬ 
tion. 
Plat V, 179 vines, no treatment. 
All of the plats received eight sprayings, the first on May 1, and the 
rest, excepting the last, at intervals of fifteen days. The last spraying, 
on account of dry weather, was prolonged to 20 days. 
Plats I to IV, inclusive, were of practically the same area, but owing 
to removals of dead vines an actual count revealed the number for each 
division to be as given above. 
Of the various plats it may be said that early in the work it was ob¬ 
served that Plat I was made up of superior, and Plat III of inferior 
vines. Hence it was not expected that there would be entire uniform¬ 
ity in the yield of the various divisions even if the treatment for all had 
been the same. The pruning for 1890 was done in March, and at the 
same time the weeds, grass, and old berries were plowed under. This 
work was rather hastily done, as could be seen from the quantities of 
debris lying about under the vines even as late as the middle of April. 
Applying the Remedies .—In this work three spraying machines were 
tried ? namely, the Eureka, manufactured by Adam Weaber, of Vine- 
land, N. J.; the Japy, made for us by the Columbia Brass Works, of 
Washington, D. C., and a Little Giant machine manufactured by the 
