112 BOAKD OF AGRICULTURE. [Pub. Doc. 



glucose and sprayed with arsenate of lead with no glucose, 

 and it was the most successful year we had ever sprayed. 

 Perhaps the greater success was due to the improvement in 

 the outfit. I do not think the glucose helps the poison to 

 adhere. It may, by making a more dense solution, insure a 

 better distribution of the poison. The chemist told me that 

 after the first rain yo.u could find no glucose on the leaves. 



Mr. BABB. I asked the question because it seemed tome 

 Mr. Clark was a strong advocate of glucose, and my opinion 

 was it was not necessary, an unnecessary expense, so might 

 as well be saved. 



Mr. CLARK. I would answer that question in regard to 

 glucose that the expense of it is almost nothing, and it 

 does make the arsenate of lead adhere most thoroughly. I 

 began the campaign against the elm-beetle the earliest of 

 anybody in this valley, probably. I commenced with one 

 three-horse steam-power boiler, and I think for all large 

 towns and cities it is well to have one steam sprayer for 

 the work, because it is very difficult to put ladders up 70 

 and 80 feet, and we have trees here nearly 90 feet high. 

 With a steam sprayer we can spray these high trees very 

 fast, and by an attachment we have on the engine we can 

 spray two small trees at the same time with the steam 

 sprayer, trees 30 or 40 feet high, if it is required. Of 

 course for the smaller trees of the town, I think it certainly 

 is well to have the Ware pump that has been spoken of here. 

 I believe that is the one used in Worcester. 



Mr. DRAPER. Yes. 



Mr. CLARK. In buying that pump I wish to say this, 

 you want to buy it entirely with brass connections, because 

 those fitted with steel or iron will corrode. With brass fit- 

 tings it can be used for years. I have prepared a little 

 paper for superintendents of parks, part of which I would 

 like to read to you, because it gives a hint of how to com- 

 mence the work : 



First, examine carefully, in the month of July, all the 

 elm trees under your care, and see if any of the leaves are 

 skeletonized, that is, if the green portion of the leaves is 

 eaten out and the skeleton left, 



