CEMENTS, MORTARS, PAINTS, AND GLUES. 97 



before ; boil in a closely covered kettle until dissolved ; 

 then evaporate until nearly as thick as molasses. 



FLOWER GUM. 



8. Very fine white shellac mixed with methylated spirit 

 in a stone jar ; shake well for \ an hour and place by a fire, 

 and shake it frequently the first day. Keep in a cool place. 

 Leave the camel's-hair brush in the gum. Never fill the 

 brush too full and gum the petals close to the tube. 



GUM FOR LABELS AND SPECIMENS. 



4. 2 parts of gum arabic, 1 part of brown sugar ; dis- 

 solve in water to the consistency of cream. 



5. 6 parts of best glue soaked in 18 to 20 parts of 

 water for a day, and to the liquid add 9 parts of rock 

 candy and 3 parts of gum arabic. 



6. Good flour and glue, to which add linseed oil, varnish, 

 and turpentine, \ ounce each to the pound. Good when 

 labels are liable to get damp. 



