ATHENS. 241 
removed it from the Acropolis, we sent it to CHAP. 
England*. A bluish-grey limestone was also \ . i t 
used in some of the works; particularly in the 
exquisite ornaments of the Erecthtum, where singular 
the frieze of the temple and of its porticoes are 
not of marble, like the rest of the building, but 
of this sort of slate-like limestone : the tym- 
panum of the pediment is likewise of the same 
stone ; a singular circumstance truly, and 
requiring some explanation 3 . It resembles the 
limestone employed in the walls of the Cella of 
the Temple of Ceres at Eleusis, and in buildings 
before the use of marble was known for pur- 
poses of architecture; such, for example, as 
the sort of stone employed in the Temple of 
Apollo ztPhigalia*, and in other edifices of equal 
antiquity: it effervesces briskly in acids, and 
has all the properties of common compact lime- 
stone; except that it is hard enough to cut glass, 
(2) It is now in the Vestibule of the University Library at Cambridge. 
See "Greek Marbles," No. XVII. p. 39- Camb. 1809. 
(3) For this fact the author is indebted to Mr. ffilkins, author of 
the Antiquities of Magna Gratia, &c. 
(4) Specimens of this slate-ltke limestone were brought to the 
author for the Mineralogical Lecture at Cambridge, from the Temple 
of the Phigalian dpollo in the Morea, by Mr. Walpole. It is also found 
upon Parnassus, and in other parts of Greece. Some of the limestone 
of Parnassus breaks with a conchoidal fracture, and is hard enough 
to cut glass. 
VOL. VI. It 
