' 450 Miscellanies. 
well pulverised. Expose the two mixtures together, in an earthen 
vessel, to a gentle heat: when they are well commingled, pour the 
whole into a vial, and keep it well corked. When it is to be used, 
place the vial in hot water, and warm also the vessels of porcelain ot 
glass which are to be mended. It will be better that the broken 
surfaces, after having been glued together carefully with this cement, 
remain pressed into close contact during, at least, twelve hours. The 
broken places will then remain as firm as the other parts—Idem, 
Jan. 1830. 
3. Method of preventing iron and steel from rusting.—This easy 
method consists in heating the steel or iron until it burns the hand; 
then rub it with virgin or pure white wax. Warm it a second time 
50 as to melt and divide off the wax, and rub it with a piece of cloth 
or Jeather until it shines well. 'This single operation, by filling all 
the pores of the metal, defends it completely from rust, even though 
it should be exposed to moisture.—Ibid. 
4. To make sealing wax.—Those who use large quantities of seal 
ing wax may find it economical to make it, which is very &): 
Take equal weights of gum lac, vermillion, and pure Venice tur 
tine. Melt them over a gentle heat, and stir them well togethe 
Take a detached portion of the mass, and roll it with the hand upo? 
a plate of copper slightly heated ; or rather it may be cast in@ 
made on purpose, of plaster, of horn, or of copper. Instead ° 
vermillion, other colors may be used, according to the tint which 
is desired that the wax may have.—Jbi 
5. On the solvent power of hard waters, by WiLL1AM West, Est 
—The earthy salts exert a great influence in preventing the solves! 
action of water on vegetable substances ; the proportion dissolved 
pure or soft water, being considerably greater than that by hard walet- 
Thirty six grains of tea were treated with hard and with soft wal 
by pouring upon that quantity, in similar vessels equal portions 
boiling water, bard and soft. After standing for the same time, ihe 
infusion in the hard water, left, on evaporation, after deducting ie 
weight of thé earthy matter, about four grains of extract. The lea® 
when again dried weighed thirty two grains, showing the correcte® 
of the estimate. The extract from the soft, or distilled wate 
pretty exactly eight grains; the leaves, after drying, twenty cig 
grains. Thus the soft water had extracted from the tea just sue 
