89 



3. Leaves kept 'perfectly dry can hardly he injured by the arsenites, even 

 when they are applied very abundantly. 



4. Applications made in the heat of the day and in the bright sunlight do 

 not injure foliage more than when applied in the cool of the day. 



6. The only effect of a heavy rain or dashing shower folloiving an applica- 

 tion of one of the arsenites is to lessen the injury to foliage. 



6. Leaves suffering from a fungous disease are more susceptible to injury 

 than are healthy leaves. 



7. When freshly mixed and applied, London purple is most and white 

 arsenic is least injurious to foliage. 



8. White arsenic in solution should not he used upon foliage without first 

 adding lime, Bordeaux mixture or some other substance to prevent its injurious 

 effects upon foliage. 



9. White arsenic, if ollowed to stand many days in tvater before being 

 applied, will do far greater harm to foliage than if applied as soon as mixed 



10. Lime added to London purple or Paris green in luater greatly lessens 

 the injury that these poisons would otherwise do to foliage. 



11. Lime added to a mixture of white arsenic in water will greatly in- 

 crease the injury that this poison ivould otherwise do to foliage. Lf the arsenic 

 is all in soliction, the lime ivitl then lessen the injury, as in the case of London 

 purple or Paris green. 



12^ London purple (Paris green and white arsenic have not yet been 

 tried) can be used, at least, eight or ten times as strong ivithout injury to foliage 

 if applied in common Bordeaux mixture instead of tuater. 



13. The arsenites cannot by any ordinary method be successfully mixed in 

 a kerosene emulsion. 



14. The arsenites mix readii}^ in resin compounds and do not seem to be 

 more injurious to foliage than as ordinarily applied in water. 



15. The arsenites in strong soapy mixtures do considerably more damage 

 to foliage than when applied in water only. 



16. The arsenites mix readily in carbonate of copper solution and do not 

 seem to do more harm than when applied in water only. 



17. London purple in sulphate of copper solution does vastly more harm 

 than when applied in luater only. • 



Honey Bees and Arsenicals used as Sprays. — Mr. H. 0. Kruschke, of 

 Juneau county, Wisconsin, in the American Garden for January, 1890, p. 57, 

 warns prospective sprayers that the first man caught applying arsenic to trees in 

 full bloom will be prosecuted — reasoning that the spraying of such trees will result 

 in the storage by the bees of poisoned honey, the consumption of which will be 

 dangerous. 



In our Report for last year, (1889, page 87) we quoted from Insect Life an 

 account from Prof. Webster of the spraying of fruit trees without any ill results 

 to either bees or honey. " The prevailing belief," says Insect Life, " is, however, 

 the other way, and cases are on record where serious destruction of bees has 

 resulted from spraying. In the case of the apple, particularly, the application 

 should not be made until the bloom has begun to fall, when no injury will be 



