On the Phoenician Tin Trade in Cornwall, by R. Edmonds. 25 
the Wolf Uock ; and one of the Scillj Isles, none of which has a 
shadow of reason in its favour. The public are now so fully ac- 
quainted with the rightful claims of the Mount that no author will 
in future deny it to be the Iktin of Diodorus. 
Mr. Wm. Pengelly, F.R.S., in a paper read before the Royal 
Institution of Great Britain, on 5th April, 1867, " On the Insulation 
of St. MichaeVs Mount, Cornwall,'" concludes, that the Mount " pos- 
sesses all the characters, and occupies the position of the Iktis of 
Diodorus, and no other existing island has any claim to this dis- 
tinction " 
In a paper " On the Antiquity of Man in the South - west of 
England,'' read on the 23rd of July, 1867, at the general meeting 
in Barnstaple of the Devonshire Association for the Advancement 
of Science, &c., the same author refers again to St. Michael's Mount, 
to prove that its insulation dates long before the Christian era. 
In doing this, he occupies several pages in showing the utter im- 
probability of its having been first insulated (as some authors have 
supposed) so recently as the eleventh century, by a tremendous irrup- 
tion of the sea, or by a subsidence of the coast. The following geo- 
logical facts point to the same conclusion, while they also prove 
that a very extraordinary irruption of the sea did take place about 
that period, but not such as to make any change in the daily in- 
sular and peninsular condition of the Mount. 
In my paper read before the Royal Geological Society of Corn- 
wall, in 1816, " On the Origin of the Sand-hillocks of St. Ives Bay 
and Mountshay,'' I showed that the sand which forms them has, for 
the most part, been blown in from the shore, and has accumulated 
imperceptibly upon a continuously growing vegetable surface, — the 
deposits during a single storm being too slight to cover the herbage, 
or to check its growth, except occasionally. Such occasional com- 
plete coverings and destructions of the herbage by sand-storms are 
shown by the thin dark lines — the remains of old vegetable sur- 
faces—which alternate with thick layers of light sand not contain- 
