134 



course, the greatest advantage is that it is cheaper and it 

 saves a great deal on freight rates if you have to ship it any 

 distance, but outside of that, if the freight rate isn't any 

 lower, it might be just as well to use the ordinary lime- 

 sulfur. 



THE PRESIDENT: Have you tried the contbination ? 



MR. DAVENPORT: With arsenate of lead? 



THE PRESIDENT : No, I mean the combined form. 



MR. DAVENPORT: No, I haven't. 



A MEMBER: I wonder if a great many people don't 

 burn the lime. That is the trouble in slaking, that if the 

 Jime is lively it is liable to burn, and if it is burned, the lime 

 mixture is not much good. 



PROF. FARLP^Y : You mean by not adding sufficient 

 water to properly slake the lime? 



A MEMBP^R: If you had a large chunk, not getting it 

 in quick enough, and it would get very hot. 



. PROF. FARLEY: That might occur if your lime is in 

 very large lumps, or you fail to add enough water to keep 

 the mixture in the form of a thick paste. Sometimes after 

 you add the sulfur paste to the slaking lime the mixture be- 

 comes quite dry, and unless you add enough water to keep 

 the mixture in a liquid form, the lime is liable to burn and 

 make a poor mixture However we have more unsuccess 

 ful results in preparing the self-boiled mixture by using a 

 poor grade of lime, than by improper slaking. 



QUESTION : How can you tell if it is a poor grade un- 

 til after you buy it and try it? 



PROF. PARLEY : We have had much better results and 

 I am sure it pays us to buy the high grade of lime for pre- 

 paring self-boiled lime-sulfur mixtures. We have had limtj 

 so poor that small chunks dropped into a pail containing a 

 little water showed no more action that the same number of 

 stones. On the other hand, you drop a chunk of high grade 

 lime in a pail containing some cold water and it will start 

 off just as soon as it touches the water. That is the kind of 



