APPENDIX IT. 



327 



influence over the vigor of the branches and the quality of their 

 products, we recommend in preference that the following pro- 

 cess be employed. 



It consists in planting on the side of the wall which is to 



Fig. Tl. 



receive the trellis only the number of stocks sufficient to form 

 five cordons, at the most. As to the other five cordons, 

 if the height of the wall requires ten, they should be established 

 by means of stocks planted on the other side of ..the wall, and 

 which may pass to the front through holes pierced in the wall 

 at each point where a cordon is desired (Fig. Tl). When the vines 

 have grown through the wall, the opening should be closed with 

 clay in order to avoid injurious currents of air. The cordons 

 fovmed in this manner are preferred by the cultivators of Tho- 

 mery for the lower cordons of the trellis. They have remarked 

 that the vines planted on the shady side of the wall present a 

 stronger growth than the others, doubtless because the soil is 

 less dried by the heat of the sun, and that the greater part of 

 their stems escapes the action of the solar rays. Should these 

 vines form the upper cordons, the size and abundance of their 

 leaves would injure those below. In placing them, on the con- 

 trary, on the lower part of the trellis, their too great growth 

 is diminished, and their clusters nearer the ground are subject 

 to a more elevated temperature, by which their ripening is 

 hastened. 



This ingenious method may also be used for trellises composed 

 of five cordons, but which are placed in a soil so dry and 



