172 THE CONNECTICUT P0M0L0G1CAL SOCIETY. 



Discussion. 



Prof. Scott: I want to add that in our experiments 

 with the boiled lime-sulphur we used as the maximum amount 

 five pounds of sulphur and two and one-half pounds of lime 

 for each fifty gallons of water. In general spraying, how- 

 -ever, only four pounds of sulphur should be used. I would 

 recommend that, because we were just on the danger line. 



Mr. Fenn: How much lime? 



Prof. Scott: Two and one-half pounds. Half as much 

 lime as sulphur. 



Question: How about commercial lime-sulphur? 



Prof. Scott: In my opinion, it is not so safe to use. 

 When we diluted it, it was not strong enough to prevent the 

 T^rown-rot and scab. The self-boiled lime-sulphur is a dif- 

 ferent preparation. It is scarcely more than a mechanical 

 mixture of sulphur and the lime suspended in water. It is 

 prepared by placing the lime in a barrel, pouring the water 

 over it in sufficient quantity to slack it into a thin paste. 

 When the lime begins to slack, the sulphur is poured on, 

 having first been run through a sieve to break up the lumps. 

 The slacking of the lime produces enough heat to violently 

 boil the mixture for three or four minutes. As soon as 

 the lime is slacked down into a thin paste, water should be 

 added and the cooking process stopped, because if you heat 

 the mass enough the sulphur goes through a change which 

 will cause the solution to burn the foliage. Peach foliage is 

 very susceptible, and these sulphides in the preparation are 

 -very caustic, and should be avoided. 



Question : How does dry arsenate of lead compare 

 with the paste as it is in the market? 



Prof. Scott: I have not tried the dry. I should think 

 it would be more difficult to use in liquid, — more difficult to 

 mix up with the water. The paste form, I should think, 

 would be preferable. 



