Royal Society. 119 
"Ihe Giant's Caufway^ ly Tir. Sam. Foley. Phil. Tranf. 
N° 212. p. 170. 
TH E Giant\ Caufway is ^oove 8 Englip miles north-caft 
from rhe town oi Colraht^ antt* about three from the SuJJj- 
tnillSy almoll directly north ; it runs from the bottom of an high 
hill into the lea, how far is not known, but at low water its length 
is about 600 foot, and its breadth, in the broadeft place, 240 
foot, in the narroweft part 120 5 it is alio very unequal in height, 
being in fome places q<> foot above the level of the flrand, and 
in other places about 15 foot; it confiits of many thoufand pil- 
Jars, moft of which fland perpendicular to the plane of the hori- 
zon, and dole to each other; but Dr. Foley could not dilcera 
whether they run down under ground like a quarry or not; Ibme 
of tiie pillars are very long and taller than the reit, others /hort 
and broken ; fome again for a great way are of an equal height, 
fo that their tops form a level plain furface; many of them arc 
imperfect, crack'd and irregular; others entire, uniform and 
handiome, and theie of different ihapes and fizes; thev are almod 
all pentagonal or hexagonal, only a few have feven (ides, and the 
pentagons are more numerous than the hexagons, but they are all 
irregular; Ibme of the pillars are 15, fome 1% inches, Ibme again 
two foot in diameter ; none of them is one entire ilone, but every 
pillar confifts of feveral joints or pieces, of which fome are <;, 
fome 12, fome 18 inches, fome 2 foot deep; theic pieces jic as 
clofe as it is poffible for one ilone to lie upon another, not joint- 
ing with flat furfaces, but one of them is always concave lu ihc 
middle, the other convex; thele joints are not always placed 
alike; for in fome pillars the convexity is always upwards, and 
in others it {lands always downwards ; when you force them rian- 
der, both the concave and convex iurfaces are very finooth, 35 are 
alfo the iides of the pillars, which touch each other, being of a 
whitifli free-ftone colour, but of a finer and elder grit; whereas 
upon breaking fome pieces off them, the infide appears like 
dark marble. The pillars ftand clofe to each other, and tho* 
fome have five fides, and others of them fix, yet their contexture 
is fo adapted, that there is no vacuity between them, the inequa- 
lity of the numbers of the fides of the pillars, being often m a 
very furprifing and wonderful manner, throughout the whole 
caufway, compenfated by the inequality of the breadths ^tA an- 
gles of thofe fides ; fo that the whole at a little diftancc looks 
very regular, and every fingle pillar retains its own thickneis, its 
angles and fides from top to bottom. Thole pillars, which 
ieem 
