F. 1\. Petherbridgb 231 



In these experiments the average amounl of fluid applied to cadi 

 tree was about six gallons. 



Two plots were used for each mixture. The first application was 

 made early in March just as the buds showed signs of swelling, and 

 the second application was made a fortnight later just as the leaves 

 were beginning to show. 



Plots B, D, F, I, K, and M wore sprayed on March 1th and 5th 

 in fine weather, and rain fell on March 6th. 



Plots C, E, G, J, L, and N were sprayed on March 18th. 



There was a little snow falling while these plots were being sprayed 

 but not sufficient to prevent the sprays from drying on the trees. 

 After the spraying there was a heavy fall of snow which washed oft* 

 some of the spray. 



After spraying a band of Tanglefoot was placed round each of the 

 42 twigs in order to prevent any young suckers from crawling on or 

 off the shoots. 



Twigs were cut on March 13th and kept in the Laboratory and on 

 these the suckers began to hatch on March 20th. On the plots they 

 did not begin to hatch until April 8th. This lateness of hatching was 

 probably due to the cold nights experienced after the second spraying 

 as the buds were sufficiently advanced to provide nourishment for 

 the suckers on March 18th, and it was for this reason that the second 

 spraying was done earlier than was originally intended. 



Maximum and Minimum Temperatures taken on the 

 Experimental Plots. 



Max. Min. 



March 26 44 29 



27 43 25 



28 44 21 



29 41 22 



30 46 22 



31 48 27 



April 5 59 28 



6 56 30 



7 55 43 



8 55 34 



The suckers continued to hatch until April 28th. The number 

 of suckers which hatched were counted on April 29th to May 6th. 



