Part 29 (2/2)

_Pernicious_, hurtful, dangerous

_Ore_, theout of the mines, which contains the metal

What is Black Lead?

It is a kind ofblack or bluish color, soft and unctuous to the touch; it is insoluble in acids, and infusible by fire Black lead has been found in reater or less purity, but it is the English black lead which is the

_Infusible_, not capable of being melted

Is Black Lead a proper term for this mineral?

No; because, in reality, there is not a particle of lead in it On the spot where it is procured, it is called by two or three different nao

Where is the best Black Lead found?

The best and greatest quantity is found in England, in a mine near Keswick, in cu, drawing, &c; for this purpose it is sawn into slips, and fitted into a groove in a strip of soft wood, as cedar, &c, over which another is placed and fastened with glue

What is Platina?

A metallic substance, more recently discovered than the ous to the perfect old,--ous_, bearing a resemblance

Whence is its name derived?

It is the diminutive of _plata_, silver, to which it appears very sirains

_Diinal

Whence is it obtained?

Mostly from Russia, and, also from South America Its color does not tarnish by exposure to the air, and appears to be equally perold; thealloyed with all reat labor may be rendered21 ti

Are there any other Metals besides those already mentioned?

In addition to the metals known and used by the ancients, the che other earths, added more than thirty to the number of metals, sohter than water All the metals possess different and distinct properties from each other They are divided into two classes, the ain divided into two others,--namely, those which are easily, and those which are with difficulty fused

What do you y?