72 The Horticulturist's Rule- Book. 



Cement and Mortar (Boiler Cement), continued. 



3. Powdered litharge, 2 parts ; silver sand and slaked 

 lime, of each, 1 part ; boiled oil enough to form a paste. 



These cements are used for stopping leaks and cracks in 

 boilers, iron pipes, stoves, etc. They should be applied as 

 soon as made. 



Tar Cement. — Coal-tar, 1 part ; powdered slate (slate 

 flour) , 3 or 4 parts ; mix by stirring until thoroughly incor- 

 porated. Very useful for mending watering-pots, barrels, 

 leaky sash, etc. It remains somewhat elastic. It does not 

 adhere to greasy surfaces. It will keep for a long time be- 

 fore using. 



Copper Cement. — Beef blood thickened with sufficient 

 finely powdered quick-lime to make it into a paste is used to 

 secure the edges and rivets of copper boilers, kettles, etc. 

 Use immediately. 



Fireproof or Stone Cement.— Fine river sand, 20 parts; 

 litharge, 2 parts ; quick-lime, 1 part ; linseed oil enough 

 to form a thick paste. Used for walls and broken stone- 

 work. 



Earthenware Cement. — Grated cheese, 2 parts ; pow- 

 dered quick-lime, 1 part ; fresh white of egg enough to form 

 a paste. Use as soon as possible. 



For fine earthenware, liquid glue may be used. 



Cement eor Glass. — Methylated spirit sufficient to render 

 liquid a half dozen pieces of gum-mastic the size of a large 

 pea ; in another bottle dissolve the same quantity of isin- 

 glass, which has been soaked in water and allowed to get 

 surface dry, in 2 oz. of methylated spirits ; when the first is 

 dissolved add 2 pieces of either gum-galbanum or gum-am- 

 moniac ; apply gentle heat and stir ; add the solution of isin- 

 glass, heat again and stir. Keep in a tightly stoppered 

 bottle, and when used set in boiling water. 



Sealing-Cements. — 1. Beeswax, 1 lb. ; resin, 5 lbs. Stir in 

 sufficient red ochre and Brunswick green, or lamp-black, to 

 give the desired color. 



2. Black pitch, 6 lbs. ; ivory-black and whiting, of each, 

 1 lb. Less attractive than the former. 



These are used for sealing up bottles, barrels, etc. 



