THE NEW AGRICULTURE. 221 



destroy the canker worm, codling moth and numerous other in- 

 sects that are liable to do injury. This application could be made 

 at an expense of from three to five cents per tree, and should be 

 applied whether there is canker worm in the orchard or not. The 

 canker worm is becoming far more prevalent each year throughout 

 the country. As the codling moth should be treated to the poison 

 even in the absence of the canker worm, it will be seen that there 

 is no excuse for permitting the canker worm to defoliate the trees." 



As we referred in a former chapter to the statement of Professor 

 Roberts to us that clover roots had been traced to a depth of 

 eighteen feet, the following communication sent by him to Mr. 

 Chas. A. Green, Editor of that admirable monthly, The Fruit 

 Grower, will be of interest ; 



AGRICULTURAL DEPARTMENT, CORNELL UNIVERSITY. 



ITHACA, N. Y., July 30, 1885. 

 Mr. Charles A. Green: 



DEAR SIR : The Tribune of July 14, containing an article on 

 " The New Agriculture " is received. In it you say that Mr. Cole 

 says that " Professor Roberts of Ithaca has told him that he has 

 traced red clover roots to a depth of eighteen feet that were 

 growing in a bed of gravel overlaying water." Mr. Cole must 

 have misunderstood me, as it was corn roots not clover roots that I 

 was speaking of to him when I visited his place the week before 

 you were there. I have a clover root preserved in our museum 

 two feet nine inches long, which was taken from the borders of a 

 nearby cellar. The roots of this plant, which was one year old, 

 were nearly traced to the depth of the cellar four feet but they 

 were so delicate that it was impossible to preserve their entire 

 length. 



At the Iowa Agricultural College the railroad company under- 

 mined a portion of the corn field in August, 1873, to get gravel 



