152 AMERICAN VINES. 



resistance to chlorosis is concerned, and possessing a high 

 degree of resistance to phylloxera. They are to be pre- 

 ferred to Solonis, except in the case of damp or brackish 

 soils. 



The Solonis and other forms of Novo-Mexicana do not owe 

 their resistance to chlorosis to the species they originate from ; 

 we are therefore forced to admit that this property is an 

 independent character, acquired by an actual selection in the 

 surroundings where they naturally grow. 



All this group of hybrids comprise forms which root freely 

 from cuttings, are vigorous, and have a large trunk. Their 

 resistance to phylloxera is certainly not very high ; the 

 Solonis have even been used as a limit in the study of 

 resistance to the insect. It bears numerous nodosities and 

 tuberosities, sometimes penetrating, followed by grave con- 

 sequences. The phylloxera weakens Solonis to such an 

 extent that sometimes in dry and only slightly fertile soils it 

 occasions its death. In soils to which this cepage is well 

 adapted, phylloxera has practically no action on it. Vine- 

 yards of seventeen to thirty years old, which were grafted 

 from thirteen to nineteen years ago, are still in existence in 

 the Herault, Gironde, Dordogne, where they still remain 

 fine and vigorous. To sum up, Solonis has only withered 

 when grafted in very calcareous, very poor, or very dry 

 soils. 



We consider it necessary to give the distinctive characters 

 of the principal cepages of this group. The description of 

 Solonis will serve as a term of comparison. 



T. V. Munson selected, amongst Novo-Mexicana, many 

 interesting forms of great vigour, more resistant than Solonis 

 and of perhaps equal resistance to chlorosis. The two prin- 

 cipal are the Novo-Mexicana Hutchison and the Novo-Mexi- 

 cana Mobeetie. The Hutchison has great analogy to the 

 Solonis, but is more vigorous ; the Mobeetie has characters 

 approaching closer to Rupestris than any other form of this 

 group. The Novo-Mexicana forms D, Microsperma, No. 43 

 and C, No. $6, and Solonis Microsperma^ are of much inferior 

 vigour to the other three forms. We will mention also in this 

 group a form which seems to be rather a hybrid of Riparia 

 X Candicans than a Riparia X Rupestris X Candicans, a 

 form which T. V. Munson considered to be a species, the 

 Doaniana. 



The following is the comparative scale of resistance and 



