70 



:miscellakeous. 



from its former combination with the sul- 

 phuric acid, and in a short time, these 'two 

 fluids, previously colorless, become in- 

 tensely black. To make this black fluid into 

 Ink, nothing but a little gum is required to 

 retard the precipitation of the feculae. — 

 same. 



On Preparation of Borax for the 

 blow-pipe. — Take one ounce of borax, 

 coarsely pounded, put it into a clean cru- 

 cible, and cover it loosely, put the whole 

 into a furnace, and watch it till it ceases 

 to swell, then augment the heat, and when 

 the whole fuses quietly, take it out, and 

 pour it into a wedgevvood-ware or metallic 

 mortar, and when cold, reduce it to an 

 impalpable powder, in which state it is to 

 be used. — same. 



Composition of the Bronze of the 

 Jincients. — The proportion consists of 88 

 parts of copper and 12 of tin, and this ad- 

 mixture of the metals has been employed 

 by nations very re?Tiote from each other. 

 — same. 



depth of an inch, care being taken not to 

 wound or bruise the rind in the operation. 

 The cabbages are then suspended by means 

 of a cord, tied round that portion of the 

 stem next the cabbage. 



That portion of the stem from which the 

 pith is taken being uppermost, is regularly 

 filled with water every morning. — same. 



Tainted Meat may be perfectly re- 

 covered by first rubbing it with charcoal 

 powder and then boiling it in water with 

 small pieces of charcoal. 



Rancid Oil may also be rendered sweet 

 by it. 



Stagnant Water boiled with charcoal 

 will be found to possess the properties of 

 spring water. 



// may also be used medicinally to ad- 

 vantage in cases of Putrefaction, Gan- 

 gre7ie, Putred jevers 8,-q,., in which case 

 it should be used freshly made or put in 

 close vessels immediately after being pre- 

 pared to be used as occasion may require, 

 it is considered a powerful anteseptic. — 

 same. 



Method of cleaning Brass Ornaments. 

 — Brass Ornaments that have not been 

 gilt or lacquered may be cleaned, and a 

 very brilliant color given to them by 

 wasliing them with alum boiled in strong 

 ley, in the proportion of an ounce to a 

 pint, and afterwards 

 fine tripoli. — same 



rubbing them with 



Burning Glass. — Sir Isaac Newton 

 presented a burning glass to the Royal 

 Society, which consisted of seven con- 

 cave glasses, so placed that all their foce 

 join in one physical point. This instru- 

 ment vitrifies brick or tile in one second, 

 and melts gold in half a jninute. 



Method to prevent the escape of gas 

 from barrels and other vessels. — This is 

 effected by placing a piece of air-tight sub- 

 stance around the bung so as to prevent 

 the air from passing through the pores of 

 the wood or between the bung and the 

 vessel. — same. 



Preservation of Cabbages. — The cab- 

 bage is cut so as to leave about two inches 

 or more of the stem attached to it ; after 

 which the pith is scooped out to about the 



DEFINITION OF TERMS. 



Beginning ivith the letter C. 



Calcination. — In Chemistry such a 

 management of bodies by fire as renders 

 them reducible to a caix or cinder. 



As most metals were reducible to this 

 form the term calces of metals was long 

 appropriated to them; but in science the 

 term is supplanted by the characteristic 

 appellation of oxide, which expresses the 

 peculiar change that occurs in calcining 

 metallic bodies by the absorption of oxy- 

 gen. Calcination and oxidation are not 

 strictly synonymous, even when applied 

 to metals, since the true sense of the for- 

 mer implies the agency of fire, but the 

 metals may be oxydated by the action of 

 the acid, as well as that by heat and air. 



Caloric. — A word used to denote that 

 substance by which the phenomena of 

 heat are produced. 



When caloric elevates bodies above the 

 temperature of the surrounding medium, 

 it is known by the name of sensible heat, 

 and which may be measured by a common 

 thermometer, or Wedgwood's pyrometer. 



The absolute heat (or whole quantity of 

 caloric existing in a body) may be ascer- 

 tained by the calorimeter of La Place. 



■m 



