296 THE CULTURE OF THE GKAPE. 



form ; it did not induce the forming of roots, as did some 

 of the others. The reason of this, undoubtedly, was the 

 powerful nature of this substance, which, in the exposed 

 circumstances of the roots, was, in all the trials, too 

 strong. 



The cow manure and ashes had the most beneficial ef- 

 fect ; that is, they caused the bottles to be filled, in the 

 least time, with roots and rootlets innumerable : although 

 the strength of the liquid was constantly increasing, 

 there did not appear to be any injurious efiect therefrom. 



