230 report — 1884. 



map of Northern Norway (' Geologisk Kart over det Nordlige Norge ') 

 on the same scale, was published in 1879 by T. Dahll. 



There is no regular publication of memoirs and papers of the survey ; 

 but they appear in ' Nyt magazin for naturvidenskab,' and in other 

 journals, transactions, and University treatises. The collection made by 

 the survey is at present deposited in the Mineralogical Cabinet of the 

 University of Christiania. 



Portugal. 1 



Secqao dos Trabalhos Geologicos de Portugal (Lisbon). 



This survey was commenced in 1857 (as Commissao Geol. de Portugal). 

 It was reorganised with the existing title in 1869, under the direction of 

 Carlos Ribeiro ; he was succeeded, in 1883, by J. F. N. Delgado. 



The work is now done on the scale of 1 : 100,000 ; with occasional 

 enlargements to double this scale. There are contours at intervals of 

 25 metres. The map will be in 37 sheets, longitude reckoned from 

 Lisbon, 9° 9' W. of Greenwich. The topographical map is not yet 

 complete, and none of the sheets are published with the geology. 



Several memoirs have been published, dating from 1865 ; and also 

 a general map — ' Carta Geologica de Portugal,' by C. Ribeiro and 

 J. F. N. Delgado, scale 1 : 500,000 ; 1876 (now out of print). 



Prussia. 



Konigliche Geologische Landes-Anstalt und Bergakademie zu Berlin 



(Berlin). 



The publications of this survey date from 1870; the director is W. 

 Hauchecorne. 



The map—' Geologische Special-Karte von Preussen und den Thurin- 

 gischen Staaten 'is on the scale of 1 : 25,000 ; with hill-shading, and con- 

 tours at intervals of 5 metres. 



It is divided into 88 ' Grad-Abtheilungen ; ' each subdivided into 60 

 1 Blattern,' excepting on the frontier and sea-board, where some sheets are 

 absent. Each complete ' Grad-Abtheilung ' contains exactly 1° of long, 

 and 1° of lat. ; each ' Blatt ' contains 10' of long, and 6' of lat. ; the sheets 

 are therefore not quite rectangular. The longitude is reckoned from 

 Ferro, 18° 9' W. of Greenwich. 



The publication takes place in ' Lieferungen,' each containing from 

 three to nine maps of the same district, though not always in the same 

 ' Grad-Abtheilung.' The ' Lieferungen ' vary in price according to the 

 number of maps included, averaging 2 marks per map with its ' Erlau- 

 terung.' The maps near Berlin are especially agricultural, minute 

 variations of soil being indicated by signs ; these form a special set of 

 maps, in 27 sheets. In the coal districts two editions are issued, one 

 showing the edges of the coal-seams beneath the newer rocks. 



1 The first part of the serial publication of this Survey has just been issued — 

 ' Commnnicaqoes da Secqao dos Trabalhos Geologicos de Portugal,' torn. 1, fasc. 1, 1885 ; 

 8vo. Lisbon. Some of the papers therein contained had been previously printed. 





