HEATING. 



57 



described for the first style of house. It is best to 

 leave at least eight feet between each two houses to 

 faclitate ventilation, the taking out of plants and 

 soil, clearing off the snow from the roofs, and other 

 necessary work. 



So much for the main points involved in the 

 construction of the two principal styles of houses. 

 In the matter of heating we have considered only 

 hot water, as we believe it has advantages over 

 steam in growing violets. A proper boiler is of 



14. Fastening- pipes to 

 posts by tin clips. 



15. Fastening- pipes to posts 

 by bent wire nails. 



the utmost importance so important in fact that 

 the most careful consideration should be given to 

 its selection. Notwithstanding all that 

 has been written on heating it is a 

 fact that nearly every man who goes 

 into greenhouse work is dissatis- 



