New York AGRICULTURAL EXPERIMENT STATION. 131 
rains followed by hot sultry weather led him to expect an attack 
of late blight, but for some reason it did not appear. In this 
experiment there was no blight at all. The dates of spraying 
Uwere july 6; 12, 23, 31, August 7, £3°and'28. 
SUMMARY OF VOLUNTEER EXPERIMENTS, 1904-1909. 
The following table shows the results obtained in the volun- 
teer experiments during the past three years —s1904 to 1906 
inclusive: 
Taste XVII— SwHowrnc Resutts oF VOLUNTEER EXPERIMENTS, 1904-1906. 
SS  ———— ————————EEEEEEEEE—EEEE——E—————E———E———E———————————_—_—_—_—_——————,, 

Average 
Average market price 
ee Number of Total area gain per acre per bushel 
experiments. sprayed. due to of potatoes 
spraying. at digging 
time. 
A. Bu. lbs. Gis: 
LOOM cay san tes fee es ow. 5 41 364 | 58 28 AS ID 
LE ESS ol Moe 50 407 | 59 32 57.0 


Sn hee pork ~ 62 598 | 53 6 44.5 
AN EXPERIMENT AT RIVERHEAD. 
The following experiment does not belong to any one of our 
three classes of potato-spraying experiments and so must be 
considered separately. It was conducted by F. A. Sirrine on a 
field of potatoes belonging to H. H. Hallock, Riverhead, Long 
Island. 
Forty-eight rows of potatoes covering an area of 2.07 acres, 
were divided into 12 plats of 4 rows each. Six plats were 
sprayed four times (June 25, July 10, 20 and 25) with a one- 
horse, four-row Hudson sprayer carrying two nozzles per row. 
The remaining six plats were left unsprayed for checks. The 
sprayed plats alternated with the unsprayed ones. The bor- 
deaux mixture was applied at the rate of about 4o gallons per 
acre in each spraying. No poison was used with it. “ Bugs” 
were kept well under control on sprayed and unsprayed plats 
alike. This part of the work was managed by the owner, Mr. 
Hallock. He applied paris green in dry form by means of a 
one-horse, four-row Leggett potato duster. 
The potatoes made a large growth of vines. Late blight ap- 
peared the second week in July and by July 20 was well estab- 
‘lished on the unsprayed rows. There was also some on the 
