TWENTY-FIRST ANNUAL MEETING. 199 



Dr. Clinton : No chemical formation. I have not 

 studied it from that point of view. There seems to be a 

 general belief that the arsenites of lead combine with the 

 lime and sulphur and form a combination that is injurious 

 to the foliage, but that either of these alone would not pro- 

 duce injury. We have always used the poison in our lime 

 and sulphur. As we have not carried on spraying with 

 the lime and sulphur alone, we have not had any data to 

 show that one would be more injurious than the other. The 

 impression is. that the arsenate of lead when added causes 

 a great deal of injury. 



President Rogers : There is still time for more ques- 

 tions. 



A Member: I would like to ask if spraying with Scale- 

 cide will kill the scale. 



Dr. Clinton : Yes sir, it will kill the scale if you use it 

 in the right proportions. If you know that the trees are 

 infested you can use either Scalecide or lime and sulphur. 



President Rogers : I would like to ask if the home- 

 made lime-sulphur mixtures are generally preferable to 

 these commercial mixtures that are made up and put on 

 the market? 



Dr. Clinton : I think for the ordinary grower that it 

 is better to bu}- the commercial lime and sulphur rather 

 than to make it up. If he is a big grower, he can make it 

 up cheaper than he can buy it. The ordinary grower 

 wants to get along with as little difficulty as he can, and 

 that is one of the reasons why it is best and easiest for him 

 to buy it and put it on his trees. It hardly pays the small 

 grower to buy the ingredients and make up the mixture him- 

 self. For the Bordeaux mixture I prefer the home-made 

 to any of the commercial kinds. 



A Member : Which do they consider the most effectual, 

 the commercial lime-sulphur or the Scalecide in comljatting 

 scale on dormant trees? 



