556 Geological Society. 
and at Himlingoie several specimens of Turritella not hitherto known 
as living. 
From the difference of the fossils, together withthe manner in which 
the gravel beds are disposed upon the chalk, he infers that the older 
strata have been elevated and submerged more than once. 
Dr. Beck says that space does not permit him to give his views re- 
specting the erratic blocks, and he merely states that their depo- 
sition took place after the beginning of the tertiary period, and went 
on during the accumulation of blue marl and sand, from which he has 
obtained more than 70 species of shells now living in the German 
Ocean; and that he has proofs, of which he intends to give a more 
detailed account hereafter, that the transportation of these blocks 
continues on the coast of Jutland. 
In conclusion the author mentions the existence of several, small, 
lacustrine formationsin the interior of Jutland and of Moen, containing 
remains of Lymneza, Physa, Helix, &c. ; and an extensive formation 
of sand cemented by oxide of iron. 
An extract from a letter addressed to the President by H. Edwin 
Strickland, Esq., F.G.S.,dated Athens, 26th Oct., 1835,was then read, 
Mr. Strickland noticed first at Trieste the vast formation of secon- 
dary limestone which appears to extend thence uninterruptedly into 
Greece ; and of which the Ionian Islands are almost wholly composed. 
In Corfu, however, are several obscure and complicated patches of 
tertiary deposits, and in Cephalonia is a Pliocene formation of vast 
thickness, containing abundance of fossils. Mr. Strickland then de- 
scribes the currents of sea-water which constantly flow into the land 
near Argostoli in the island of Cephalonia. This extraordinary phe- 
nomenon occurs about a mile north of Argostoli at the very extremity 
of the rocky promontory which separates that town from the large bay 
on the west. The promontory is composed of the hard, white, second- 
ary limestone, the strata dipping about 30° to the east ; and at this 
spot it contains several species of shells which in general are rather 
rare. The streams of water have been noticed for many years rushing 
in between the rugged masses of rock of which the coast consists, but it 
was only about two years since that they excited the attention of the 
English. Mr. Stevens of Argostoli, desirous to turn them to advan- 
tage, was induced to stop up three of these holes, and by excavating 
a channel at the principal one, has been enabled to obtain a sufficient 
supply of water to turn a mill. The channel which has been made is 
about three feet wide, and the average depth of the current is six 
inches. In the mean state of the tide the fall is about 3 feet, the usual 
rise of the tide being 6 inches, but during southerly winds itis consi 
derably more. After passing the wheel the current flows for 6 or 7 
yards, and is then partly absorbed in swallow holes and partly disap- 
pears under the rocks. The water at the bottom of the excavation at 
greatest at high tides, the quantity of water then flowing in being 
greatest. A small freshwater spring enters the excavation on the land 
side, and when the sea is effectually stopped out, renders the water at 
the bottom of the excavation quite fresh in the course of a day; rais- 
ing it at the same time several inches to a certain point, where it rests. 
