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planation of the meaning of the term “ cross-keele groats;” 
and stated his opinion that it was the Irish word cpoé caol, 
(cross-keale, or slender cross,) and that it was applied by 
the native Irish to distinguish the groats of this period from 
the other kinds with a broader cross, which were in circula- 
tion. There are many instances of coins being denominated 
from some peculiarity of their type, e.g. Angel, Salute, 
Harpers, &c. 
Many other points of interest to numismatists were fully 
considered in this communication, and accurate drawings of 
the coins described were exhibited. 
Dr. Apjohn read a note by George J. Knox, Esq., “on 
the oxidating Power of Glass for Metals, and on the want 
of Transparency in ancient Glass.” 
“In alate work, which treats of the manufacture of glass, 
an experiment of Guyton Morveau is mentioned, in which 
six per cent. of copper filings having been mixed with 
pounded glass, and the compound completely melted, it was 
found to have assumed a red colour uniformly diffused 
throughout the mass, so deep as to render the glass nearly 
opaque. The experiment originated from a workman in the 
glasshouse having dipped a heated copper ladle into a pot 
of fused glass. The copper ladle was melted ; the casting 
and annealing of the plates were proceeded with as usual ; 
and on their completion the workmen were surprised to find, 
that not only were grains of metallic copper embedded in 
the substance of the glass, but bands uniformly coloured of 
a fine bright red, were distributed throughout the mass. 
** The experiment of Guyton Morveaun, being but a repe- 
tition of the accidental one made by the workman, seems to 
have but little engaged his attention, the colour being con- 
ceived to be due to an imperfect state of oxidation, as oxide 
of copper imparts to glass a greenish colour. 
“It appeared to me, at first sight, that the red colour was 
