FOREIGN CORRESPONDENCE. 
143 
north-east to south-west, as far as Litten, coming to the surface 
south-westward in zones gradually narrowing and disappearing near 
Litten, beneath the Litten strata, are particularly conspicuous. On 
the other hand, the " Litten strata" very extensive, and totally over- 
laid by Upper Silurian limestones in the vicinity of this place, begin 
there to be di^aded into two stripes, intercalated in the foldings of 
" Konigshof" and " Kossow strata," decreasing in breadth as they 
proceed north-eastward, and at last totally disappearing between 
Harlik and Wonoklas. 
Isolated portions and zones of " Litten strata," intercalated between 
*' Konigshof" and " Kossow strata" occur again in the same north- 
east direction, near Wonoklas, Cersonic, Kosor, Radotin, and Gross 
Kuckel (colonies " Haidinger" and " Krejcy") ; so that a connection 
of both these " colonies" ■s\ith the above-mentioned two zones of 
Litten strata intercalated between the foldings of Konigshof and 
Kossow strata can no longer be a subject of doubt. 
The colonies "Haidinger" and "Krejcy," where beside the 
Litten strata appear not in conformable but in disturbed stratification 
between the Konigshof and Kossow strata must therefore be con- 
sidered as remains of a once more extensive deposit, forced between 
these last strata by the foldings and dislocations they had undergone. 
Without the least depreciation of the services which geolog}^ owes to 
M. Barrande, the sagacious and indefatigable explorer of the Silurian 
strata in the centre of Bohemia, the facts just mentioned must be 
acknowledged to corroborate Prof. Krejcy's theory of dislocations 
being the real cause of the palseontological abnormities comprised 
under the general denomination of " Silurian colonies." The 
" colony" named in honour to Prof. Zippe, although at present 
inaccessible to investigation, may be supposed, by analogy, to afford 
new facts in favour of this theory. 
On the Bed Ghromate of Lead, ami useful Minerals of the Philippine 
Islands. By W. W."' Wood, Esq. 
Specimens of the red chromate of lead from the Labo mines in the 
province of North Carnarines (Isle of Luzon), obtained by Prof. 
Hochstetter, through Mr. W. W. Wood's (of Manilla) kindness, have 
been examined by M. Dauber (Academical Proc. No. 21, 1860, p. 21), 
Mr. W. W. Wood, at Dir. Haidinger's request, gave the following 
details about this interesting mineral, and the useful minerals of the 
Phillipine Islands. The chromate of lead was discovered accidently, 
and was dug out in considerable quantity ; the diggings, however, 
having been subsequently filled up, it is not at present to be obtained, 
and little is known about it at Manilla. It was afterwards found 
again in small quantities near the first locality. A Spanish mining- 
engineer, who visited the Luzon about three years ago, reported it to 
be very scarce and to be with difficulty obtained. 
There are but very few mines in the island. A very rich deposit 
of argentiferous galena, found in North Caranines, is said to be now 
abandoned after having been exploited for some time by a Spanish 
company. 
