ADAPTATION. 35 



RATE OF SPECIFIC ATTACK OF LIMESTONES continued. 



Again, other causes modify the action of carbonate of lime 

 on vines. All vinegrowers in the south of France, Saumurois, 

 Bourgogne, Champagne, etc., have remarked that vines be- 

 come yellow in the spring during very damp years, and that 

 they remain yellow until the return of the heat of summer. 



