l66 AMERICAN VINES. 



the banks of the Red River, in Indian Territory and Texas. 

 They are vigorous, but generally less so than the species 

 they are derived from. They have not been tried in France, 

 and even if they preserved, from the point of view of adapta- 

 tion, the qualities of their procreators, they could not possess 

 their value for poor lands. 



Millardet has indicated a hybrid of V. Cordifolia and V. 

 Rubra, which is, however, of no cultural interest. 



Hybrids of V. Cordifolia and V. Rupestris. 



These were propagated for the first time in France, in 1880, 

 by de Grasset. Millardet advocated them in 1882, in the hope 

 that they would prove excellent graft-bearers for bad soils. 

 H. Jaeger, who discovered them in the United States, 

 differentiated 80 forms in Missouri, Indian Territory, and 

 Arkansas, where the Rupestris and Cordifolia grow together. 



The Cordifolia X Rupestris grow in the same soils and 

 situations as the Rupestris, consequently in non-calcareous 

 soils, and in the more fertile parts of the Rupestris regions. 

 In such soils the Cordifolia X Rupestris have a great vigour 

 and large trunk. One of the best forms studied by Millardet, 

 the Cordifolia X Rupestris de Grasset No. i, roots well from 

 cuttings, and bears very fructiferous and very vigorous 

 grafts; the trunk is very strong, and its resistance to 

 phylloxera is 18. 



In calcareous chalky soils, in yellow marls, the Cordi- 

 folia X Rupestris rapidly becomes stunted, and dies from 

 chlorosis the first or second year after planting out, with- 

 out being grafted. These -vines, on account of the size 

 of their trunk, of their resistance, and their vigour, might 

 be cultivated in rich Rupestris soils, or in deep friable 

 Riparia soils; but nothing has yet shown that the Cordifolia 

 X Rupestris are superior to these two species in such soils. 

 They must, in any case, be excluded from all soils where soft 

 limestone predominates. 



Among the Cordifolia X Rupestris selected by Millardet 

 and de Grasset, the No. i is the most vigorous ; amongst 

 those isolated by Jseger the most meritorious are the numbers 

 i, 4, and 5. 



Hybrids of V. Cordifolia and V. Riparia. We have 

 already said that the forms of Riparia with thick lustrous 

 leaves might be considered as hybrids of Riparia and 

 Cordifolia. Well characterized hvbrids of this nature 



