322 TRANSACTIONS OF THE HORTICULTURAL 



mixes it with London Purple for the apple or plum, hoping by 

 that means to combine fungicide and insecticide properties in the 

 same fluid, and to accomplish two purposes with one spraying. 



LIME. 



My own experiments with lime as a protection against the 

 codling moth have already been reported in the transactions of 

 this Society, the result being altogether unfavorable. Weed has 

 made a thorough trial of it as a means of protecting cherries 

 against the curculio, applying the lime wash four times, strong 

 enough to whiten the leaves and fruit, with the effect to save about 

 forty per cent, of the cherries, which would otherwise have been 

 infested, as shown by the condition of that fruit on the check 

 trees. Experiments on the plum gave a similar result. As this 

 was only about half the saving effected by the similar use of 

 London Purple, the method was abandoned. 



CARBOLIC ACID. 



Cook used a mixture of crude carbolic acid and plaster, a pint 

 to fifty pounds, with apparent success in 1888, and failure in 1889. 

 He seems to believe on the whole, however, that it is as useful as 

 London Purple. 



In conclusion, collecting, summarizing and collating the Exper- 

 iment Station Reports of Ohio, Kentucky, Iowa, Kansas, Minne- 

 sota and Michigan, and reports of work done in Illinois, and at the 

 IT. S. Department of Agriculture, we find: 



(1) That white arsenic in solution should undoubtedly be aban- 

 doned as dangerous, if not destructive, to foliage, although it may 

 perhaps be used in simple mixture, either dry or with water. If 

 its application be followed by rain ; however, it would probably 

 even then take disastrous effect. 



(2) There is, as yet, no general agreement with respect to the 

 comparative merits of London Purple and Paris Green, and 

 more experiment will be needed on this point. The weight of 

 the evidence, is, however, to the effect that London Purple is the 

 more caustic, and that certainly it will not do for the peach. 



(3) Dry mixtures of the arsenites seem less injurious to the 

 trees than wet, and are to be preferred in rainy weather. They 

 should be applied in the morning, before the dew dries away. 

 The water mixtures, on the other hand, are cheaper and com- 

 monly more convenient, and are especially advantageous in dry 

 weather. They may be best distributed in the afternoon. They 

 will last longer on the tree if two or three pounds of starch be 

 added to each barrel. The strengths of the water mixtures vary 

 in the practice of different stations as follows: For the apple, 

 Paris Ureen in proportions varying from 100 to 160 gallons of 

 water to the pound, or London Purple in mixtures of 100 to 200 



