•106 How TO Grow Cut Flowers. 



that of a man with a gangrenous limb, — the choice is to 

 part with either limb or life. So in this, as it seems 

 to me, the most serious matter connected with rose grow- 

 ing that has ever come to our knowledge, the cause 

 must be overcome, or the business abandoned where 

 they have taken possession. 



Another precautionary measure is, never to propa- 

 gate from any plants which have become infested with 

 this disease, even in the least. 



It is my belief that wherever these nematoids are 

 present in the roots, even if only one cell has been 

 formed, their power to multiply and spread to other 

 roots on the same plant must be accomplished through 

 the circulation of the sap of the plant. So very minute 

 are their eggs they may be conveyed to any part of the 

 plant through this circulating medium. Sever a cut- 

 ting containing any of these eggs, root it, and what as- 

 surance is there that it will not be the home of a future 

 colony. Some investigations right along this line, made 

 by one interested in them, were recently witnessed by 

 the writer. The rooted cutting of a rose was the sub- 

 ject. Thia was rooted in clean sand which had been 

 taken from a bank fifteen feet below the surface. The 

 callus was reduced to pulp, put under a poAverful mi- 

 croscope, and in it could be seen distinctly two living 

 nematoids. Under a lens of 300 diameters, these ap- 

 peared to be about y\- of an inch in length. Where did 

 they come from, unless the germs were present in the 



