228 Agricultural Experiment Station, Ithaca, N. Y. 



'* The Douglas and the Deming knapsack pumps were then 

 brought into the Held and both worked well. The pumps are 

 sufficiently strong to force the Bordeaux mixture through Vermorel 

 nozzles, ai)d a very thorough application could be made. But the 

 severe labor, and the slow rate of progress will prevent this type of 

 machine from becoming popular for potato spraying. Myers' 

 'Fountain Knapsack Spray Pump' is a gravity sprayer, the liquid 

 being forced through a perforated disk by means of a rubber bulb 

 situated immediately behind it. Bordeaux mixture could not be 

 applied with this device, as the holes in the disk clogged continually. 

 "When clear water is used, good work may be done. 



" The powder guns of Leggett and of the Excelsior Co., did 

 excellent work. They are easily worked and efficient. The only 

 objection to them is that they treat but one or two rows at a time 

 and this becomes a serious fault when large areas have to be treated. 

 This objection is the more weighty when one considers that the most 

 efficient applications of powders can be made only on a still day and 

 when the foliage is wet. 



" The other pumps which were exhibited were not tested in the 

 potato field. The Deming and the Douglas pumps were found to 

 be very strong, serviceable, and apparently durable, and with the 

 proper attachments they could be made of service in spraying 

 potatoes. 



" In conclusion, it is the opinion of the committee that as a rule 

 the best machines are those in which a pump forces the liquid 

 through nozzles, so that a uniformly fine spray may be produced. 

 Gravity machines, with the exception of ' Roberts ' Improved 

 Atomizer,' proved to be unsatisfactory, although the Steitz machine, 

 if slightly modified, could be made serviceable. 



"Signed J. G. FARGO, Chairman. 



E. D. RUMSEY. 

 J. H. POTTER. 

 C. E. SIIEPARD. 

 JAY LATHROP." 



