100 



to be figured on a basis of sulphide. As I figure it soluble 

 sulphur is guaranteed 58%, or if you purchase a hundred 

 1/ounds for $7, you get about 58 pounds for $7. If a'ou 

 lairehase a barrel of lime sulphur weighing 451 pounds, you 

 will get about .130 pounds of sulphur for the same price; 

 ttserefore it looks to me as if the lime-sulphur is twice as 

 valuable as the soluble sulphur. 



PROF. PARROTT: Your figures are approximately 

 correct. In selecting spraying materials, one should consider 

 efficiency, safeness and convenience. Leaving out the ques- 

 tion of convenience and putting your selection on the basis 

 of economy and safety I should personally prefer lime-sul- 

 I>hur solution to a preparation that is composed of sodium 

 bulphides. 



A MEMBER .- Did you refer in your answer to me to the 

 (ombination of Black Leaf 40 with arsenate of lead? 



PROF. PARROTT : Yes, in our spraying against the 

 rosy aphis or pear psylla or other species of plant lice, a very 

 common combination is lime-sulphur, arsenate of lead and 

 nicotine solution. 



A IMEIMBER : "What proportion of each ? 



PROF PARROTT : It depends on whether you are mak- 

 ing a winter spraying or a summer spraying. For a dor- 

 mant treatment, use lime-sulphur at the rate of one gallon of 

 the concentrate to eight gallons of Wiater, and to every 

 hundred gallons of that add three-fourth of a pint of nico- 

 tine solution (40%). For summer spraying we add one 

 gallon of lime-sulphur to forty gallons of water and to every 

 100 gallons, add three-fourths of a pint of nicotine solution 

 ^10%). 



A MEMBER: I understood the Professor to say he 

 would spray about the time that the leaf buds started, lime- 

 sidphur, nicotine and arsenate of lead. Now, I would like 

 to ask him if he would do away witli winter spraying with 

 lime-sulphur and whether this would take the place of it. 

 In other words, I Avant to ask him the sprays he would 



