FIFTEENTH ANNUAL MEETING. 65 



we find an oil we can mix with water that will not do injury to 

 the trees, we have got something; that is g'oing to help a good 

 deal in the fight against the San Jose scale. There are sev- 

 eral kinds of these soluble petroleums or missible oils on 

 the market. I have brought along here samples of four dif- 

 ferent kinds, and you will notice from a distance that one 

 of them is entirely dififerent from the other three. One is 

 "Scalecide," and one is "Sure-kill." and one "Kill-o-scale," 

 and the other dark one is branded "Scale Destroyer." Those 

 are the four kinds I have seen on the market and advertised 

 for sale. And the expense is not very different in them all, 

 about fifty cents a gallon in barrel lots, but the quality of 

 the four kinds is quite different, showing at a glance in ap- 

 pearance. Now the directions are 20 parts of water to one 

 of oil, and that brings the cost down to less than three cents 

 a gallon. Dr. Britton told you that the lime-sulphur costs 

 a cent and a half a gallon for the material alone, and then you 

 have got to make it. These soluble or missible oils, the back- 

 ground of them, the basis, is some kind of petroleum, perhaps 

 crude petroleum, and made up with something that will let 

 them mix with water. I think I can show you in a moment 

 here what I mean by mixing readily with water. Here is 

 some water, and here is one of these preparations. Now 

 notice what happens the moment it is poured into the water ; 

 you get an emulsion immediately, and it requires very little 

 stirring. Any of you who have tried to make kerosene emul- 

 sion in the old way know what trouble it is to make it ; now 

 here you have a perfect emulsion and it will stand there for 

 weeks. So if these things work we have got a very simple 

 thing to make. I will say we don't know how these oils are 

 made, but we will find out sometime — the chemist will tell 

 us. Now let us look at the comparison of these oils with the 

 lime and sulphur wash, for instance. The evidence for the oils 

 first. These oils have been on the market only a year and a 

 half or two years, and we have not as much evidence as we 

 ought to have before recommending them ; you will find very 

 few are recommending these oils at tiie present time for 

 general work and spraying. I should say, give them a test. 

 You will find published results from some stations alreadv. 



