STATE POMOLOGICAL SOCIETY. 65 



sure of a hundred pounds is necessary. You can get that with 

 any of the common good barrel pumps but you will have to be 

 lively and to keep it up. You soon get tired — that is the trouble 

 with it. This high power spraying today is done in one of two 

 ways. First, by direct power from engines of some kind, gaso- 

 lene generally, or steam ; by power direct from the wagons in 

 various combinations ; and by power of compressed air which 

 may be pumped by the wagon and from that run the machine ; 

 and lastly by direct pressure of gases. This has been the spray- 

 ing machine. Those are the powers that are used today practi- 

 cally. The man who has any use for a gasolene engine the year 

 round, or a good share of the year, had by all means better use 

 that, if he has a man who knows how to run the engine. If he 

 tiusts it to the ordinary man he will probably buy a new engine 

 every spring. The pressure by air from the running of the 

 wagon works very nicely in the West. I know of no one using 

 it here. In* the West I can see that it might be a practical 

 machine to work ; where the land is level and it is easy to run, 

 that power is satisfactory. But in our hilly lands here it is rather 

 difficult to run an engine properly on the up and down grades 

 and irregularities that you find in spraying. And so a year ago, 

 after looking the matter over, I induced our people to get us one 

 of the gas sprayers. This is simply a tank made solid like a 

 boiler in which we put the material for spraying, and then an 

 attachment of the very same material that you made soda water 

 of — that is all it is — in another tank, and by its expansion in this 

 tank it makes the pressure and forces out the liquids. That 

 is the whole process. The beauty of that thing is, the only 

 kind of a man you have to have is one who can run a monkey 

 wrench. I wouldn't hire that kind of a man if I could help it, 

 but he will run it and he can't get it out of order very well. 

 He may waste a lot of gas. It is hard to estimate the expense 

 as it varies widely, but it takes from five to seven pounds of 

 this compressed gas (of course the liquid form) to empty a hun- 

 dred gallons of spray. A hundred gallons will spray from 

 twenty to fifty trees, that depends altogether on the size of the 

 trees. The gas costs from four to six cents per pound. You 

 can make your figures from that. 



Question : What is the material ? 



Prof. Gulley: Liquid carbonic acid, that is all. It is just 

 exactly what the soda fountain men buy, in compressed tanks. 



