HEATING GLAZING. 13 



hot-water pipes in the brickwork, and one at the end over 

 the doorway. The top lights are fixed. 



Heating. 



With respect to this, nothing is better than hot water in 

 four-inch pipes ; it is also better to have plenty of piping 

 than to have too little ; there is nothing saved by economy 

 of that kind ; better spend a little more money for material 

 at first than have to add afterwards ; by having plenty of 

 pipe you do not require so much fire-heat, which is better 

 for the plants, and you save the expense in fuel in a very- 

 short time. I should, therefore, advise four pipes instead of 

 three ; by having four, you do not require to drive the fire 

 so much on a frosty night. I never use steam ; I find that 

 I can get plenty of moisture without it, by pouring water on 

 the tables and paths, which I consider much better than so 

 much steam poured on the plants direct from rusty pipes or 

 tanks. The boiler should be outside of the house. I have 

 seen them set underneath, which I think bad. I remember 

 going to see a collection of Orchids where the boiler was so 

 situated. The gentleman said he had put it there to econo- 

 mise heat, and the plants were growing very finely at the 

 time. I remarked that I should be afraid of smoke getting 

 into the house ; he replied, there is no fear of that, for I 

 have got the boiler well covered over. Only a few months 

 afterwards I went to see the same collection, the smoke had 

 got into the house, and had spoiled many of his plants. I 

 merely mention this to show the ill effects of a boiler being 

 set so that smoke can get into the house. When outside 

 there is no fear of such a disaster. 



Glazing. 



The laps here are very close ; the squares are two feet six 

 inches long by nine inches in breadth ; the glass in the 

 upright sashes at the sides is fourteen inches long by nine 



