266 



Vineyard Culture. 



of the atmosphere is subjected to this fall of tem- 

 perature. 



The winter frosts, which occur late, do not act in the 

 same way as the white frosts, and, contrary to what 

 happens in the case of the latter, vines situated at ele- 

 vated points suffer more than those placed in the shel- 

 tered valleys. Exposures to the west, north, and east, 

 are more affected than those to the south. 



The causes producing the late winter frosts being 



[Fig. 103.] — Plantation 

 adapted for Matting^ at 

 the rate of 5,200 Fines 

 to the Acre. 



[Fig. 1 04. J — Plantation 

 adapted for Mattings at 

 the rate of 6,000 Vines 

 to the Acre. 



different from those giving rise to white frosts, the 

 means employed to obviate them should be different. 

 For this purpose, we must have recourse to more ef- 

 fective, and, unfortunately, more expensive shelters. 



Doctor Jules Guyot is the first who has thought of 

 adapting to vineyards, the mats employed in gardens for 



