318 



EXPERIMENT STATION— BULLETINS. 



of the different arsenites, and whether the date of treatment and atmospheric 

 condition had any influence. The following is a tabulated statement of the 

 experiments: 



Date. 



May 20.. 

 May 20.. 

 May 21.. 

 May 23.. 

 June 7... 

 June 7. 

 June 7... 

 June 7... 

 June 7... 

 June 7... 

 June 12.. 

 June 12.. 

 June 12.. 

 June 12. 

 June 24.. 

 June 24.. 

 June 24 . 

 July 5... 

 July 8... 

 July 8... 

 July 8... 

 July 10.. 

 July 10.". 

 July 10.. 

 July 11-. 

 July 11.. 

 July 11.. 

 July 11.. 

 July 11.. 

 July 15.. 

 July 15.. 

 July 15.. 



Variety 

 Treated. 



6 plum trees. . 



2 cherry trees. 



4 apple 



5 cherry 



3 willow 

 3 elm 

 3 h. maple 

 5 apple 

 5 cherry 

 5 plum 

 3 elm 

 3 plum 

 3 apple 

 3 cherry 

 3 apple 

 3 peach 

 3 plum 

 5 peach 



2 peach 

 1 cherry 

 1 pear 

 1 pear 



3 peach 



1 plum 



2 peach 

 2 peach 

 2 peach 

 2 peach 



2 peach 



3 peach 

 3 peach 

 3 peach 



Poison Used. 



Lon'n p'ple 1 lb. to 200 gal. 



1 lb to 150 gal. 

 1 lb to 100 gal. 



1 lb. to 200 gal. 



Paris gr'n, 1 lb. to 100 gal 



1 lb. to 200 gal 



250 gal 



300 gal 



London purple water 



W'te ars'ic 1 lb. to 300 gal 

 Lon'n p'ple 1 lb. to 200 gal 

 Solution analine 



Date of 



Second 



Application, 



June 5. 



May 23... 



June 12.. 



June 17. 



Time after 

 Treatment 



Ten days 



Five days 



Weather. 



Effect. 



Rain 21, 23 



Rain 25th 



No injury. 



t n 



i it 



Some. 



None. 

 Some. 

 Much. 



None. 

 Very bad. 



li It 



U II 



Great injury. 



Slight, 

 Some. 



Very bad. 

 Quite bad. 

 Slight. 

 None. 



Great injury. 



tt *. 



None. 



I think; we are warranted in the following conclusions : First, London 

 purple is more injurious to the foliage than is Paris green; and white 

 arsenic — aresenious acid — is more harmful than is either London purple or 

 Paris green. This is doubtless owing to the soluble arsenic which is quite 



