322 FORCING DEPARTMENT. 



Gardener, expressly says, in that valuable work, 

 " the Practical Gardener," lately published, vol. 1, 

 page 553, — " Trellissing is now universally made of 

 wire, as being lighter, stronger, and more durable 

 than wood, and capable of being put up at much 

 less expense." It is evident, from the above para- 

 graph, that Mr. M'Intosh considers even wire more 

 durable and stronger than wood. Now, when this 

 Author is convinced of the superiority of a material 

 that is so very liable to corrode, being preferable to 

 wood, in the erection of the trellissing, where strength 

 and durability are so requisite for the support of 

 trees and fruit, which rest, in most instances, 

 entirely upon it, I am at a loss to divine how the oppo- 

 nents of metallic roofs can assert that this material 

 is injurious to vegetation, in consequence of its 

 corroding qualities. Surely, fruit, foliage, and shoots, 

 would be as much injured by the wrought iron or 

 wire trellissing, with which they are constantly in 

 contact, and which are so very subject to corrode, 

 as they possibly can be by metallic roofs. 



The trellissing is, unquestionably, the first part of 

 the structure that is likely to give way, when com- 

 posed of wood, in consequence of the pressure it has 

 to resist, and owing to its being kept almost con- 

 stantly in a damp state, by the frequent syringings 

 of the trees, &c, which soon rot the wood-work. 



