ON VINERIES. 



?A 



consider the saddle boiler the most simple, and very 

 powerful when properly set in brickwork. I recommend 

 it should be made of the best wrought - iron plates, say 

 three-eighths of an inch in thickness. 



It is important, where there are several houses together 

 to one or two boilers, to have them in all cases made to 

 heat, independently of each other, direct from the mains, 

 always taking care that superior stop-taps are fixed in 

 the flow and return pipes of the different houses. The 

 same remark applies where bottom - heat pipes are re- 

 quired. Makers of iron boiler-plates will, I think, agree 

 with me in constructing the boilers of the most superior 

 metal. This would save many from being disappointed, 

 and serious loss in fruit and choice plants would 

 seldom or never occur. I have known cases where, 

 after the failure of the boilers, the houses had to be 

 covered up with mats, bags, or anything likely to keep 

 the cold out ; and before the faulty materials could be 

 renewed, the loss was very serious, and the fruit and 

 plants very seldom recovered. 



I have permission from the intelligent head gardener 

 who has the management of the extensive gardens be- 

 longing to His Grace the Duke of Portland at Welbeck, 

 Notts, to refer to his opinion of the heating apparatus 

 which was placed in the hothouses at Welbeck under my 

 superintendence, and I think I cannot do better than 

 quote the words of his letter to me : — 



