118 CRANBERRY CULTURE, 



provided it does not injure the berries. I find a differ- 

 ence of opinion among growers as to the eifect that water 

 would have upon the berries at that time, and the matter 

 could only be decided by experiment. 



At their first appearance, I think it would be useless to 

 flow, as at that time the berry is almost completely water- 

 tight. 



Mr. Wm. Chipman, of Sandwich, once tried with suc- 

 cess strewing ashes over the vines, just as the berries were 

 setting. Mr. Joshua Cole, of Eastham, once tried tobacco 

 water with good effect ; he tried it again another year, 

 without success. 



It will be necessary for those who experiment with such 

 things to be well posted in regard to the habits of the 

 insects they are dealing with, as a few hours' difference in 

 the time of using any remedy might make success impos- 

 sible. 



There is but one other caterpillar that has yet proved 

 very destructive to the cranberry, and that is known as 

 the 



BLACK SPAN WORM, 



although it is far from being black. 



I first met with this insect at Harwich, August 25th, 

 1869, where I saw some that had been taken from the bog 

 of Mr. Wm. H. Underwood, where they did much dam- 

 age. They also injured the vines of Mr. Nathaniel 

 Hinckley, of Marston's Mills. 



I sent some of these span worms that were taken on 

 Mr. Underwood's bog to A. S. Packard, Jr., M. D., of 

 Salem, who was publishing a work on insects. 



He gives a description of it in his work called "A 

 Guide to the Study of Insects," a work that should be in 

 the hands of every one who has insects to deal with. 



Dr. Packard says of it : " It is a dull reddish-brown, 



