108 STATE HORTICDLTURAL SOCIETY. 



all over the orchard and pick out the caterpillars where we had not 

 sprayed. We made an experiment last year with the Bordeaux mix- 

 ture and we did not kill our trees or destroy a great deal of the foliage, 

 but we injured the fruit. We were very careful and made that spray 

 with formula No. 3 of the Bordeaux mixture and reduced it to a very 

 fine condition, the finest condition we were able to produce, and we 

 were very careful. The trees did not show any damage for some three 

 weeks after the sprayiug was done. It was dry that length of time 

 after the spraying was done. About three weeks after we had sprayed 

 there came considerable of a fehower and then the sun came out after 

 the shower and about 30 per cent of the leaves turned yellow and fell 

 off, and we damaged the foliage to those trees very greatly while we 

 did not destroy it, and we also damaged the crop of peaches, they did 

 not attain the size the others did. I am very much elated over the 

 discovery of the arcenate of lead spraying; our peaches we have made 

 experiments on this season are entirely free from any depredations so 

 far and are growing nicely without any indication of damage done. 



Mr, Stedraan — Do you know what solution you used for the cater- 

 pillars ! 



A. Fifteen ounces to 100 gallons of water. 



Prof. Stedman — The arcenate of lead was nothing that originated 

 with me at all ; it was discovered by a gypsy some years ago, and 

 simply as a matter of experiment I tried it on the trees this year. In 

 fact no one man did discover it. The beauty of it is that you can use 

 it on the trees in almost any strength and not injure the tree. 



Fifteen ounces of arcenate of lead in 100 gallons of water is equiv- 

 alent to one pound of Paris green to about 150 gallons of water. 



You will understand that it must be used in different strength on 

 different trees. The arcenate of lead contains a little less arsenic than 

 the Paris green and we have to use a little more in weight, but it has 

 this advantage, aside from the fact that it will not injure the trees it 

 requires less exertion to keep it suspended in water, while the other 

 requires almost constant stirring and mixing. 



Arcenate of lead has been deaionstrated to kill any insects that 

 eat, no matter what they are ; but in some instances it mast be stronger 

 than in others. You use arcenate of lead the same as you would use 

 Paris green, only you must always use more of it. Paris green costs 

 in bulk about 19 6ente a pound ; the arcenate of lead is a little cheaper 

 by weight, but inasmuch as you have to use more in weight it brings 

 it up to about the same expense with this advantage that you do not 

 need the lime with the lead. It is necessary to add a little glucose,, 

 otherwise the arsenic falls off the tree ; but glucose is cheap, and by 



