36 NEW YORK STATE MUSEUM 



of trees 2, 4 and 6 of plot 1. Additional engine troubles developed 

 and the work was interrupted by a heavy shower, followed by* rain 

 most of the afternoon and the completion of the spraying of these 

 plots was left in the hands of Mr Strickland. Plots 2 and 3 were 

 sprayed on the west side, under the supervision of Mr Strickland, 

 on June 6th and on the east side June 5th. A " Gilford " angle 

 nozzle was used and a pressure of 250 pounds maintained. The 

 calyxes were closing rapidly and these plots were sprayed with the 

 west wind, since it was not deemed wise to wait for an east wind. 

 Plot 3 was sprayed on the west side of the trees on June 5 th, the 

 same straight nozzle being used as was employed to spray the east 

 side of the trees June 2d. 



Four pounds of " Adheso " were used for each 50 gallons. The 

 following is a transcription of the ingredients as stated on the label : 



Metallic copper 2.8 to 2.9 per cent 



Dry lead arsenate 27^ to 28! per cent; inert ingredients 64 to 69 per cent; total 



arsenic (expressed as percentage of metallic arsenic) 5! to 6 per cent 

 Arsenic in water soluble form less than | of 1 per cent 

 The metallic copper and metallic arsenic present are equivalent to " copper 



hydrate " for 4.2 to 4.35 per cent, arsenic oxide 8.9 to 9.3 per cent 



It will be seen from the above formula that the amount of poison 

 actually applied was relatively light and approximately equivalent 

 to 2 pounds of 15 per cent arsenic oxide (paste arsenate of lead) to 

 50 gallons of water. 



The second application to plots 2 and 3 was made on the morning 

 of June 20th, a very heavy home-made lime-sulphur wash being 

 used, approximately 6 gallons of this to 180 gallons of water. This 

 home-made mixture contained a considerable amount of sediment, 

 and even after the addition of so much of this preparation, the 

 hydrometer read less than 1.1 per cent. Thompsen's paste arsenate 

 of lead was used at the rate of io| pounds to 180 gallons. Spraying 

 began at 9.30 and was completed at 11. 10, the application being 

 restricted to the 12 experimental trees, 155 gallons being applied. 



An examination at this time showed that many of the leaves on 

 the Baldwin trees were badly spotted and that a considerable number 

 had turned yellow. Some were on the ground and others were 

 dropping. This unfortunate condition is very probably due to 

 burning following the application of the lime-sulphur wash just 

 after the very heavy showers of June 1st and 2d. 



The third treatment was practically identical with the second 

 and was given in early August under the supervision of Mr Stahler. 



