Foreign Vegetables. 237 
formed upon its Surface by the Heat of the Sun. 
If this Cruft have a brown Colour, and a Mixture 
of Dirt, it is called Thus variegatum , Thus vulgar 
&c. Common Frankincenfe. 
2. Palimpifidy dry Pitch, is what remains after 
Diftiliation of the groffer Part of the Turpentine, 
being an hard friable Subftance, of a reddifh, brown 
Colour. 
3. Pix nigra artificial! s^ Artificial black Pitch, 
which is made of the Palimpifia and common Tar. 
4. Pix naval* s y common Pitch, which is prepar- 
ed by mixing the artificial black Pitch with Palim- 
pifia, Beef-Suet, and common Tar, and melting them 
together over the Fire. 
5. ZopiJJa or Apochyma. This is the Pix navalisy 
after it has contracted a Saltnefs from the Sea- Water. 
6. Pix Burgundiaca , Burgundy Pitch, which is 
compounded of white Refin, common Turpentine 
and Oil of common Turpentine melted together. 
7. Pix nigra liquida , or Pix liquida vulgaris , Li- 
quid Pitch or common Tar is got by burning the 
Trees when they are old, and full of Refin ; where- 
by the black refinous Juice runs out into Trenches 
or Vefiels prepared to receive it. This is done either 
when the Trees are (landing, or in Furnaces which, 
are built for that Purpofe. 
8. Pificeleum , Oil of Tar, is a black oily Li- 
quor which rifes to the Top of the Tar after it has 
flood a while in Cafks. Sometimes another Sort 
of Palimpifia , or dry Pitch, is made by boiling 
the thicker Part of the Tar to Drynefs. 
The Smoke of all thefe refinous Subftances pro- 
duces a black light Soot, which is called noir de 
fumee , and is often ufed in preparing fome Colours, 
and in the Ink of Printers. Another Soot like it 
is gathered from the Burnt Lees of Oils, but this 
being fat and oily is not fo much valued. 
Both 
