217 



III the case of white arsenic an opposite effect was produced. '^ It 

 will be seen by referring to the table that the white arsenic did from 

 three to twenty times as much damage when combined with lime as 

 when the lime was left out." 



Tabular data are also given for experiments with London purple and 

 Paris green combined with rosin, soap, Bordeaux mixture, sulphate of 

 copper, and carbonate of copper, respectively. 



Conclusions. — The author divides his inferences into two classes: (1) 

 those which he regards as well proven by the experiments, and (2) those 

 requiring further investigations. In the first class are the following : 



(1) The oldest leaves aro most susceptible to iujury from arseuical applications. 

 They ofteu turn yellow ami drop without showing the burnt, spotted appearance. 



(•2) Dews, and probably direct sunlight, increase the injuries done by the arsenites 

 to foliage. 



(3) Leaves kept perfectly dry can hardly be injured by the arsenites, even when 

 they are applied very abundantly. 



(4) The only elfect of a heavy rain or dashing shower following an application of 

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



(5) When freshly mixed and applied, London purple is most and white arsenic is 

 least injurious to foliage. 



(6) White arsenic in solution should not' be used upon foliage vrithout first adding 

 lime, Bordeaux mixture, or some other substance to prev^ent its injurious eftects upon 

 foliage. 



(7) White arsenic, if allowed to stand many days in water before being applied, 

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



(^8) Lime added to London purple or Paris green in water greatly lessens the injury 

 that these poisons would otherwise do to foliage. 



(9) Lime added to a mixture of white arsenic iu water will greatly increase the in- 

 jury tliat this poison would otherwise do to foliage. If the arsenic is all in solution, 

 the lime will then lessen the injury, as in the case of London purple or Paris green. 



(10) London purple (Paris green and white arsenic have not yet been tried) can be 

 used at least eight or ten times as strong without injury to foliage if applied in 

 common Bordeaux mixture instead of water. 



(11) The arsenites can not by any ordinary method be successfully mixed in a kero- 

 sene emulsion. 



(12) London purple in sulphafe-of-copper solution does vastly more harm than 

 when applied in water only. 



The following are the doubtful conclusions : 



(1) Applications made in the heat of the day and in the bright sunlight do not in- 

 jure foliage more than when applied in the cool of the day. 



(2) Leaves sulfering from a fungous disease are more susceptible to injury than are 

 healthy leaves. 



(3) The arsenites mix readily in rosin compounds and do not seem to be more in- 

 jurious to foliage than as ordinarily applied in water. 



(4) The arsenites in strong soapy mixtures do considerably more harm to foliage 

 than when applied in water only. 



(5) The arsenites mix readily in carbonate-of-copper solution and do not seem to do 

 more harm than when applied in water only. 



Stocks for the cherry, plum, prune, and apricot, J. L, Budd, 

 M. H. (pp. 421-430). 



The cherry.— Attention is called to the fact that though the Mahaleb 

 Stock is extensively used, practical fruit growers hold the most diverse 



