Greenhouse Heating. 29 



purlins of one-inch gas pipe, and braces of the same 

 material can be made to support them by connecting 

 them with the iron supports of the roof, which should 

 be of two-inch pipe. Seven pipes for heating are used 

 in this house, one of which is in the roof, three feet 

 below the ridge through which the flow is carried, re- 

 turning in six pipes of the same size, as seen in Fig. 18. 

 Instead of facing directly south, if built to face s. s. 

 east, it is claimed that both the morning and afternoon 

 sun will have the greatest effect, or rather, will be more 

 equally divided. 



I should hesitate to build in this way, unless the two 

 side benches could be used for small pot plants. In 

 this case, if these were built two feet wide and near the 

 glass, it would permit of an eight foot bench in the 

 middle of the house which would no doubt do splendid 

 work. 



CHAPTER IV. 

 GREENHOUSE HEATING. 

 The problem connected with this much agitated 

 question, has been solved to the entire satisfaction of 

 the advocates of the different systems time and time 

 again, and still, one who would commence ancAV is as 

 much in the dark as ever, as to which is the best for 

 him to adopt. Climate, fuel and space enter largely 

 into the decision of the question in each individual 



