95 
DISCUSSION. 
Mr. Anderson : At the last Convention we asked Dr. Wil- 
cox about the spray. As we have only used this material for 
about a year, he might be able to tell us what 4ie thinks 
about it. 
Dr. Wilcox: As I said this morning, I have used several 
formulas at the Station, I believe you found thai 1 lo 20-24 
is about right; about a hundred gallons covers an acre. At 
that rate, only 5 pounds of arsenic were used per acre. It is 
in a very soluble form. The most of it is held upon the plant 
and finally falls down when the plant falls down or if you 
burn it up, it is burned up in that way. Five pounds per acre 
is actually less than has been applied for 20, 30 and 40 years 
on the same ground in orchards on the mainland, without 
causing any injurious effects on the soil. The presence of 
arsenic, even in a soluble form, would not cause a burning 
effect on the roots, because they are too thickly covered with 
bark and the mere presence of it at that rate does not cause 
any harmful effect on plants. I don't see any reason why we 
should worry about that. If it is to be kept up for years and 
years and years, you might think there might be an accumu- 
lation. The soluble salts are continually washed out of the 
soil, and I do not believe it could accumulate beyond a cer- 
tain limit. I doubt whether it will ever accumulate. 
Mr. Turner: I may say that in spraying our trees, the 
barrel Avas placed between two trees and in dipping out from 
the tin there was a certain amount of dripping and the exact 
amount that was wasted I do not know, but it was merely 
dripping. The bark burst open and bled all the way through 
and the tree was defoliated. 
Dr. Wilcox: How much was poured in there? 
Mr. Turner : I was not along with them at the time. The 
trees are not dead, but they have not recovered yet. 
Mr. Cooke : I would like to offer a suggestion to the Con- 
vention at this time. It seems to me that we are about get- 
ting to a position where the rubber will be placed on the mar- 
ket. It might be a good idea to have a committee look into 
the marketing conditions and make suggestions at the next 
Convention. It seems to me that if a certain standard of rub- 
ber can be produced, possibly a unique form of putting it 
upon the market might give the Hawaiian planter a certain 
advantage. I don't believe there is much call for a report, but 
just offer this as a suggestion. 
Chairman Lufkin : It seems to me eminently in order that 
such a committee should be appointed. 
Mr. Cooke : I make it as a suggestion, and as a motion also. 
Dr. Wilcox said that in all shipments we should maintain a 
