,96 N A T U R A £ " f l I> f |T'D R Y
quantityfufficient to conned the fendtogether; tamotenoughl to
concrete into a firm hard body. Dr. Woodward’s Gat. vol. II: p.'"3,.
fays the'inhabitants calh-it a kefriecl -ftone j that is, a -coagulated
ftone, but-juft-congealed; and indeed it is no more thanthe blown»
fand incrafted into ftone in fo many thin feparate' layers; one - over
another* as the fend Was -thrown in, mixed with the fparry iprayg
at feveral fucceffive times, by the’Northerly; winds.. Let !no pne
wonder that the fpray of the-fea IhaU produce fufch/an . effei£|;j
5 for that fpar is fufpended in all water is Hkely; but,’ in . particular
■ waters, is evident from incruftations formed in the^ bottom of cu%
nary veffels, and in water-pipes; from petrified mofspand many
other phenomena; and that fpar isalfo to be found- infea-water;
muft certainly follow, from the fea being open W, and ready
to receive, all that "fprings will convey into- it. All coralloeid
bodies and fhells are formed of fpar, modified and mixed fo as *to
comply with the occafiom of .marine plants arid animalsg. i Laftly*
fpar is wafhed out o f die cliffs and rocks expofed^to the: power, of
the fea; nay, great degrees o f heat will raife it in vapour, and
what rifes fo into the atmofphere, - is doubtlefs again conderifed and
. precipitated by wind, cold, and rainh. In feveral part’s ; o f Corn--
wall we have a lapis ■ arenaceus or. free-ftone, confifbng of fend and
quartz. Near the borough of Micheli there is a pretty .ftone; not
long fince difeovered; o f a cinereous ground,: fpeGkled with white
gravel: it works very fmooth, and keeps a neat edget 5 In Gwen^>
there is a whiter ftorie, and in Stithien one b f the’ femerkirid.' .''’
Polrudon ftone (commonly tailed PentoWan) is likewife;®f the
arenaceous kind. This ftone lies -in- a lode about fifteen feet wide,
not interfered by horizontal and perpendicular fifiures, as in jlraita
o f free-ftone, but {helving, and in irregular maffes, :aud .o f thfee
different colours; the firft and fineft of a milk-white ground,
thinly befprinkled with purple fpecks about the twenty-fourth part
o f an inch in diameter; the fecond of a cinereous ground, with
more, larger, but fainter purple fpecks; the third of a yellow
ochreous ground, fpeckled, but the purple lefe diftinft, with feme
micaceous talc thinly interfperfed. Dr. Woodward’s Gat. vol: II. page
4, had two fpecimens (b z, b 3, ib.) from this quarryone: of an jfoh-
- Colour, and indeed an irony-water, I obferved here to difeolour
fomewhat of the fuperficies of die ftones; but in the heart, I found
them always o f one of the three before-mentioned colours:. Dr.
Woodward, ibid, calls this a free-ftone, and not improperly* if he
meant only a lapis arenaceus y but . it is greatly different, both as to
* See page before, 84. about the fhores uniting with" the fand, make a
h See Woodward’s Cat. vol. 1. pa. 116— 113, folid ftope,” Linnajus Amasn. Academ. page
&c. “ About Cappellham the corals dijjjerled - 463.
Oground