CEPAGES. 



129 



Fig. 65. 



Large penetrating 

 tuberosities. 



Fig. 66. 

 Large tuberosities. 



T Fig. 67. . 



N on-penetrating 



tuberosities. 



Fig. 68. 



Non-penetrating 

 tuberosities on 



3roots of 

 American vines. 



resistance to phylloxera, adaptation, affinity to grafting, and 

 proclivity of hybrids resulting from crossings between 

 American and European vines. 



The first fact to be taken into account in hybridizations, is 

 that relating to the sterility of the pollen of flowers with 



