384 THE PARKS AND GARDENS OF PARIS. [Chap. XXIL 



speedier disengagement of sulphurous acid gas by the heat of the 

 sun, but it is dangerous to apply it if the sun is too strong." 



The pruning of the Vine is so well understood in England that 

 it is needless to give it here in the full detail with which it is 

 honoured in M. Eose-Charmeux's book, the 'Culture du Chas- 



selas.' The system as shown 

 in the illustrations is simply 

 the well-known spur-prun- 

 ing practised in nearly 

 every English vinery. There 

 are indeed several modifica- 

 tions of training; but this 

 as everybody knows is of no 

 real importance. In this 



Rose-Charmeux's System of i 'ertical Train- 

 ing. The Vines are planted at sixteen inches 

 apart. 



Vines trained Vertically with alternated 

 sp7irs, wires nine inches apart on wall; 

 Vines about twenty-eight inches apart. 



case, as with the Yine indoors, the selection of a proper medium for 

 the roots is of far greater importance than anything else, while the 

 simplest form and the best system of pruning are without doubt 

 the same as those seen in our vineries— an erect stem with the 

 side-shoots annually pruned in. At Thomery the Vine is fre- 



