CEP AGES. 187 



when grafted in the strongly chalky soils of the Charentes ; 

 unfortunately, it has not realized expectations as far as 

 phylloxera is concerned. The Chasselas X Berlandieri No. 

 41," of Millardet and de Grasset (Fig. 90), is also very remark- 

 able in its resistance to chlorosis, even in strongly calcareous 

 soils ; Millardet considers it resistant to phylloxera. 



Hybrids of V. Vinifera and V. Monticola. Several of 

 these hybrids are of fairly great vigour. Their faculty of 

 adaptation for calcareous soils, although not equal to that 

 of Vinifera X Berlandieri is rather high. Couderc has 

 created a few complex hybrids of Vinifera, Rupestris, and 

 Monticola, which present a certain amount of interest. 



Hybrids of V. Vinifera and V. Rupestris. These are, 

 along 1 with Cordifolia hybrids, the most vigorous vines in 

 existence. Their trunk increases in size .very quickly and 

 yields canes occasionally so large that a portion of the cane 

 cannot be used for grafting. The root system is also very 

 powerful. 



They strike easily from cuttings, as easily as European 

 varieties; but, like Rupestris, grafting on the growing- 

 stock does not succeed unless all the eyes on the stock are 

 removed previous to the operation. Their grafted cuttings 

 succeed well if the precautions indicated further on for Rupes- 

 tris, are taken. 



These graft-bearers are, therefore, interesting. But what 

 is their faculty of adaptation? We know that V. Rupestris 

 is largely affected by chlorosis. Its hybrids, on account of 

 their Vinifera strain, become less yellow, and when un- 

 grafted in the most chalky soils of the Charentes they have 

 a luxuriant vegetation, although sometimes at the second or 

 third year after planting out a slight yellow tint becomes 

 apparent here and there. But, when grafted, they become 

 more yellow in such soils and are quite valueless. In groies 

 soils where chlorosis has less gravity some of them thrive 

 well and remain green and vigorous whether grafted or 

 not. 



To sum up, the Vinifera X Rupestris hybrids have a 

 geographical area of adaptation much more extended than 

 the Rupestris or Riparia. In the Experimental Station of 

 Cognac, where they are planted side by side, the Rupestris 

 has a resistance to chlorosis represented by 4, the Riparia 

 by 5, the maximum being 20; the hybrids Vinifera X 



