— 39 — 



6. Injury from the use of London purple may be permanent 

 and irreparable. 



7. The length of time which the poison has been mixed appears 

 to exercise no influence. 



8. London purple contains much soluble arsenic (in our samples 

 nearly 40 per cent.), and this arsenic is the cause of the injury to 

 peach foliage. 



9. A coarse spray appears to be more injurious than a fine one. 



10. A rain following the application does not appear to aug- 

 ment the injury (Cf. trial 9. See also trial 6, which shows that 

 the arsenic passes at once into solution without the aid of rain). 



11. Meteorological conditions do not appear to influence results. 



12. Spraying the peach with water in a bright and hot day does 

 not scorch the foliage. 



13. Paris green, in ajine spray, at the rate of one pound to 300 

 gallons of water, did not injure the trees. Probably one pound 

 to 350 gallons is always safe. 



II. TRIALS OF NOZZLES. 





It is, of course, impossible to say which nozzle is best for ap- 

 plying poisons. Near- 

 ly even 7 one possesses 

 some merit which oth- 

 ers do not. The culti- 

 vator who grows a vari- 

 ety of fruits should pos- 

 sess four or five of the 

 best nozzles. The lead- 

 ing requisites of a good 

 nozzle are ability to 

 throw a copious, forci- 

 ble and fine spray and « 

 some handv means of 



graduating or varying ' "=**• 



the same Fig. 6. — Method of Spraying Bushes* 



For spraying currants and gooseberries, and other low plants 

 where the insects feed largely upon the under surface of the 



