FIFTEENTH ANNUAL MEETING. 63 



salt out. And in preparing this \vc put the sulphur throuiiii 

 the screen dry. 



Vice-President Putnam : Man is particularly blessed in 

 having more than one sense, and impressions made on the 

 mind are oftentimes greater than those made on the ear, 

 but when we hear and see at the same time, it ought to make 

 a lasting impression on the mind. Our next address is to 

 be an illustrated one, and the speaker is an acknowledged 

 authority on insects. I take great pleasure in introducing to 

 you. Prof. AI. V. Slingerland of Cornell University. 



Recent Experiments with Oils and Other Sprays to 

 Control the San Jose Scale. 



By Prof M. V^ Slingerland, Cornell University, Ithaca, N. Y. 



Mr. Chairman, ladies and gentlemen : What is the San 

 Jose scale that is being talked about so much at all our horti- 

 cultural meetings? About 35 years ago a Californian got 

 some shrubs or trees; we thought he got them from Italy, 

 but they probably came from China, because we know the 

 San Jose scale's native home is in China. In two or three 

 years it was a pest in the vicinity of San Jose, California, and 

 about 25 years ago, Prof. Comstock of Cornell saw this bug 

 and gave it a name, and it was so destructive he called it 

 the most pernicious scale he had ever seen. It was not until 

 about twelve years ago that the San Jose scale was in the 

 eastern part of the country, and we soon found it scattered 

 over thirteen states. That was in 1893. *^t the present time 

 there is hardly a state in the union that has not got the San 

 Jose scale, and we are getting it more and more every day; 

 it is turning up in New York state almost every day in more 

 and more places. When it was first discovered in the east, 

 everybody said, exterminate it! let us kill every blessed one 

 of them, and many states thought that could be done, and 

 they worked along that line to some extent. They soon dis- 

 covered that extermination was practically impossible, and it 



