176) GARDENING FOR PLEASURE. 



favorite style of greenhouse structure in the vicinity of 

 New York on well-appointed places, varied somewhat in 

 size or architectural details, according to the taste of the 



HEATING BY HOT WATER AND STEAM. 



These methods are in almost universal use, though many, 

 who do not wish to go to the expense, still use smoke flues. 

 In heating by hot water it is important that the work 

 be given to some reputable firm, whose knowledge is 

 such as will enable them not only to judge what is the 

 proper capacity of the boiler for the number of pipes to 

 be used, but also how many pipes are necessary to be 

 used for the surface of glass to be heated. Men who have 

 done a large business in heating greenhouses have far 

 better opportunities for knowledge in this matter than 

 the average gardener or florist ; and if those erecting 

 greenhouses have not had extensive and varied practice, 

 they had better be guided by the men who make a busi- 

 ness of heating, as the want of the requisite knowledge 

 of these matters often works serious mischief. Of course, 

 the size of the greenhouse or greenhouses to be heated 

 must determine the capacity of the boiler wanted ; but 

 the boiler being properly apportioned to the length of 

 pipe, the following data, used in our own establishment, 

 may be useful. In our houses, which are twenty feet 

 wide and one hundred feet long, when a night tempera- 

 ture of seventy degrees is required in the coldest weather, 

 ten runs or rows of four-inch pipe, five on each side ; 

 when sixty degrees are wanted, eight runs of pipe, four 

 on each side ; when fifty degrees are wanted, six runs 

 of pipe ; and when only thirty-five or forty degrees are 

 wanted, four runs of pipe. This is for the latitude of 

 New York City, where the temperature rarely falls lower 

 than ten degrees below zero. Latitudes north or south 

 of New York should be graded accordingly. If esti- 



