CEMENTS. 297 



isinglass (which has been previously soaked in 

 water till it is swollen and soft,) in brandy or rum, 

 as will make two ounces by measure of strong glue, 

 and add two small bits of gum galbanum, or am- 

 moniacum, which must be rubbed or ground till 

 they are dissolved ; then mix ,the whole with a 

 sufficient heat; keep it in a phial stopt, and when 

 it is to be used set it in hot water. 



A Cement for broken China, Glasses, 8?c. 



Take quick-lime and white of eggs, or old thick 

 varnish ; grind and temper them well together. 



Drying oil and white lead are also frequently 

 used for cementing china and earthen-ware ; but 

 this cement requires a long time to dry. Where it 

 is not necessary the vessels should endure heat or 

 moisture, isinglass glue, with a little tripoli, or 

 chalk, is better. The juice of garlic also forms a 

 strong cement^ and the joining can scarcely be 

 perceived. 



A Cement for C/iemical Glasses that 'will bear the Fire. 



Mix equal quantities of wheat flour, fine pow- 

 dered Venice glass, pulverized chalk, with half the 

 quantity of fine brick dust, and a little scraped lint 

 in the whites of eggs : this mixture is to be spread 

 upon a linen cloth, and applied to the crack of the 

 glasses, and should be well dried before they are 

 put into the fire. 



A Cement useful for Turners. 



Take resin, one pound ; pitch, four ounces : 

 melt these together, and, while boiling hot, add 



