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 divided 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" with 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 geology 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 paleeontological 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 Chromate of Lead, and 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 difiiculty 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. 



