MTCTTIGAN EXPERIMENT STATION BULLETINS 327 



to have the lime freshly slaked. We have used this preparation for 

 several years and find it can lie used witlioiii injuring the toliaji,e, and 

 that it is as effective as twice the (|naiitily of Paris groon. 



Sal soda is sometimes used to dissolve the arsenic, hut it j;enerally 

 adds at least fifty per cent to the cost of the preparation and makes it 

 nearly, if not quite, as expensive as Paris green. With a little extra 

 labor in boiling, tlu^ mixt iiic of liuK^ and aiscnic alone will be as effectual 

 and fully as safe. For those who care to use the sal soda, the following 

 formula is given: 



Arsenic 1 pound 



Sal soda 2 " 



Water 2 gallons 



Boil until the arsenic is dissolved. The above solution added to ten 

 pounds of lime will be sufficient for 400 gallons of spraying mixture. 

 The solution can be kept for any length of time and can be prepared for 

 use as needed. If only fifty gallons are to be used at once, one pint of the 

 solution and ttvo pounds of lime only will be required. 



THE ADULTERATION OF PARIS GREEN. 



Many of the 'failures with the use of Paris green have been 

 ascribed to its aidulteration, and this will undoubtedly account for a 

 large number of them. While it is not always infallible, any one can 

 test Paris green by adding ammonia water to a small amount, and if 

 pure it will all dissolve, forming a clear, blue liquid. In case, as will 

 often happen, if adulteration has been practiced, a mass of white material 

 remains undissolved, the amount compared with the quantity of Paris 

 green used for the test will show the amount of the adulteration. 



WHITE HELLEBORE. 



Although Paris green will give as good or better results, many per- 

 sons use hellebore upon currant and gooseberry bushes, cabbages, etc. 

 The following formula will give good results: 



White hellebore 1 oz. 



Water 5 gallons 



Care should be taken not to use this upon ripe fruit, as hellebore is a 

 poison. 



PYRETHRUM, OR BUHACH. 



For use upon plants or trees any part of which is soon to be used as 

 food, pjrethrum, or buhach, will be found an effective remedy against 

 both biting and sucking insects. It can be applied in water at the rate 

 of a teaspoonful to the gallon, or as a powder, either at full strength, 

 or with from three to five times its bulk of flour or plaster. It quickly 

 loses its strength, and to be effectual should be fresh, and should be 

 kept in a tin box or glass bottle. 



For the sucking insects, which would not be affected by the arsenites, 

 kerosene, either alone, mixed with water, or as an emulsion, may be 

 used. 



