200 GREENHOUSE AND WINDOW-GARDEN WORK 



To prevent boilers from filling with sediment or scale. 



(1) Exercise care to get clean water and that which contains little 

 lime. (2) Blow it out often. It can be blown out a little every day, 

 and occasionally it should be blown off entirely. (3) Put slippery- 

 elm bark in the boiler tank. Or, if slippery-elm is not handy, use 

 potato-peelings, flax-seed, oak-bark, spent tan, or coarse sawdust. (4) 

 Put in, with the feed-water or otherwise, a small quantity of good mo- 

 lasses (not a chemical sirup), say one-half to one pint in a week, de- 

 pending upon the size of boiler. This will remove and prevent 

 incrustation without damage to the boiler. These vegetable sub- 

 stances prevent, in a measure, by mechanical means, the union of the 

 particles of lime into incrustations. 



To prepare paper and cloth for hotbed sash. 



1. Use a sash without bars, and stretch wires or strings 

 across it to serve as a rest for the paper. Procure stout but 

 thin manila wrapping-paper, and paste it firmly on the sash with 

 fresh flour paste. Dry in a warm place, and then wipe the paper 

 with a damp sponge to cause it to stretch evenly. Dry again, and 

 then apply boiled linseed oil to both sides of the paper, and dry 

 again in a warm place. 



2. Saturate cloth or tough, thin manila paper with pure, raw lin- 

 seed oil. 



3. Dissolve If pounds white soap in one quart water ; in another 

 quart dissolve li ounces gum arabic and 5 ounces glue. Mix the two 

 liquids, warm, and soak the paper, hanging it up to dry. Used mostly 

 for paper. 



4. 3 pints pale linseed oil ; 1 ounce sugar of lead ; 4 ounces white 

 rosin. Grind and mix the sugar of lead in a little oil, then add the other 

 materials and heat in an iron kettle. Apply hot with a brush. Used 

 for muslin. 



Paint for hot-water pipes. 



Mix lampblack with boiled oil and turpentine. It is harmless to 

 plants. 



