336 Report of the Horticultural Department of the 



of brands of paris green which are on sale in this State consult bul- 

 letins of this Station in which analyses of such brands are published. 

 Paris green dissolved in ammonia. — Some fruit growers make a 

 practice of dissolving all the paris green that they use, thinking that 

 the poison will be more effectual in a liquid state. This might work 

 very well if it were not for the fact that lime must be added to the 

 paris green solution in order that injury to the foliage may be pre- 

 vented. When lime sufficient to neutralize the corrosive action of 

 the poison has been added the paris green is at once precipitated so 

 that it is in a form similar to what it was before it was dissolved. 

 Thus it will be seen that nothing is gained by the operation, but on 

 the other hand a considerable expense has been incurred since it 

 takes about a pint of strong ammonia to dissolve a pound of paris 

 green. 



LONDON PURPLE. 



London purple is a by-product in the manufacture of analine dyes. 

 It is an arsenite of lime. Compared with paris green it is a finer 

 powder, remains better in suspension, and is also cheaper. But it is 

 variable in composition, which greatly detracts from its value. The 

 directions for using paris green apply to this poison. 



HELLEBORE. 



This is a yellowish powder, obtained by pulverizing the roots of 

 the white hellebore plant. It is used as a substitute for the arsenical 

 poisons, especially for plants bearing fruit that will soon be used for 

 food. It is especially recommended for the treatment of the larvae 

 of saw flies, as the cherry slug, currant and raspberry worms. It 

 may be used dry, diluted with five parts of flour or air-slaked lime, 

 or wet, using i ounce to 3 gallons of water. 



ARSENITE OF LIME. TAFT FORMULA. 



The demand for a cheaper poison than paris green has led to the 

 use of white arsenic as a substitute. Arsenic must be used in com- 



