Various suggestions have been made from time to time for the economical using up of the smaller portions of our fuel, and we are advised to mix it with peat, clay, lime, or other materials. The best idea appears to be to make a mixture of equal parts cinders, small coal, coal dust, or coke, watering the material generously meanwhile with the strongest brine. The mixture can then be shovelled into the greenhouse furnace as it is, or sugar bags can be filled with it and one of these put in as required. The last idea gives the best results, as the heat of the furnace causes the material to congeal together into a solid mass which will take many hours to burn through. Where pitch is available a tenth part of the solid after being finely crushed can be mixed with the cinders, etc., instead of watering with brine, and will give fairly satisfactory results. In colliery districts old pit props are often available cheaply for use as fuel. The ash from these is, of course, of extreme value for digging-in purposes.
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