143 



Mr. Franklin Crocker of Hyannis, to whom I am greatly indebted 

 for assistance in my studies on the cranberry insects, keeps a supply 

 of pumps and other apparatus suitable for spraying bogs, as well as 

 insecticides for that purpose. 



There seems to be a prejudice among the cranberry growers against 

 the use of Paris green as an insecticide, but when they realize how 

 small an amount is used, and that this is entirely washed off before 

 picking time, they will see that there is no possible chance for an 

 accident. As evidence that the poison is soon removed, I will state 

 the fact that a cherry tree was sprayed with Paris green in water, in 

 Cambridge last summer, to destroy the gypsy moths ; and four days 

 afterwards, the fruit was picked and canned. The regulation Paris 

 green scare then occurred, and two jars of the canned cherries were 

 sent here to the Experiment Station and Dr. Goessmann made an 

 analysis of the contents of each jar ; but in neither of them was there 

 found the slightest trace of arsenic or copper, and therefore they 

 contained no Paris green whatever. 



In closing this preliminary paper on the study of the cranberry 

 insects, I take the opportunity to thank Prof. J. B. Smith for the use 

 of some of the illustrations used m this paper, and it affords me 

 pleasure to say that so far as my studies have already gone, they 

 quite agree with the observations of Prof. Smith. 



