'22 



ORCHIDS : HOW TO GROW THEM SUCCESSFULLY. 



superabundance of warmth, it becomes necessary to examine the 

 heating power of the boiler and pipes in order to find out the 

 defects in any part. Many kinds of boilers -are in use ; but whatever 

 description of boiler may be decided upon, care should be taken 

 that it is of sufficient size to heat whatever length of piping is attached 

 to it, so that in hard wintry weather plenty of heat may be readily 

 obtained to ensure a regular and perfect temperature without inducing 

 strain or undue pressure upon the boiler. 



BOILER IN POSITION. 



Such a boiler as shown here is one that can always be relied upon. 

 In the event of making any alteration in an existing house, or building 

 new houses, it is well to have more hot-water pipes fixed than are 

 actually sufficient, rather than not enough. For instance, a more 

 genial growing temperature is generated from, say, four pipes made 

 slightly warm, than from two pipes, which would probably have to 

 be made very hot, and so give off dry, fiery heat. When there is more 

 than one house heated from the same boiler, it is best to have sufficient 

 valves, so that the hot water can be turned on to one house only, or 

 to others also, as may be required. There are also a number of other 

 boilers suitable for heating a small amount of piping, some of which 



