ADAPTATION. 



the reconstitution of vineyards has been made a success in 

 the Mediterranean region, it must d fortiori prove a much 

 greater success in the other regions of France, and that is in 

 effect what really occurs. 



What other causes have not been invoked to explain 

 chlorosis? We will not examine them all. We must only 

 remember this that humidity, drought, or alternatives of 

 humidity and drought, deficiency of iron, deficiency of light, 

 coldness of soil, absence of colour on the surface of the soil, 

 compactness, aridity, deficiency of fertilizing principles, 

 climates too cold or too dry are not, separately or combined, 

 the cause of chlorosis. 



Chlorosis and Carbonate of Lime. Chlorosis has also 

 been attributed to the influence of the carbonate of lime con- 

 tained in the soil. What is certain and absolutely constant 

 is that this disease only manifests itself in calcareous soils, 

 and the greater the proportion of this substance present, the 

 more intense the chlorosis will be. We have never seen 

 vines become yellow except in calcareous soils, and this 

 observation may be extended to the apricot, quince, pear, etc. 

 A vine may be in a bad state, stunted, or attacked by disease, 

 but if in non-calcareous soil it will never become yellow. 

 No doubt it will not have the deep -green colour of vigorous 

 vines, but its leaves will never show the characteristic appear- 

 ance of chlorosis. This is a point upon which we wish to 

 insist, and which limits the conditions under which this 

 affection will always take place. 



Some figures, ctue to Chauzit, will show the narrow rela- 

 tion (from cause to effect) existing between carbonate of 

 lime and chlorosis. 



/. Soils in which 



American Vines 

 turn yellow. 



1. Vans (Ardeche) 



2. Beauvoisin (Gard) 



3. L6denon (Gard) 



4 Pezilla(Pyrenees-Orientales) . 



5 Ciotat(Bouches-du-Rh6ne) . 



6. Pignan (Herault) . . 



7. St. Rambert-d ' Albon (Drome) 



8. Chauvilliere (Charente-Inf.) 



9. subsoil 



10. Tout-y-faut (Charente-Inf.) 



1 1 . subsoil 



12. Chapitre (Charente-Inf.) 



grow well, and never 



Limestone. 



5.93 per cent. 



4.25 



3.67 



8.79 



0.68 



7.20 



2.92 



3.18 



4.85 



2.12 



3.65 



5.90 



