226 bepoet — 1884. 



posed of five members of the Royal Academy of Belgium, with M. J. 

 Stas as president. The surveying work is done under the direction 

 of Ed. Dupont, with three ' conservateurs ' and eleven assistants. A 

 peculiar feature of this survey is that each main division of the geological 

 series is traced out completely by one man, so that an index map of 

 progress is also a geological index map. 



The map is on the scale of 1 : 20,000, with contours at 5 metres 

 interval on the left bank of the Meuse, and at 10 metres on the right 

 bank. The map is in 72 main divisions (' planchettes ') ; each containing, 

 when complete, 8 sheets (' feuilles ') ; in all there will be 430 sheets. 

 The meridian is Paris, 2° 20' E. of Greenwich. Each sheet is accompanied 

 by ' Texte explicatif.' 



The maps give the nature of the soil, and note, by dark shades of 

 colour, the actual areas at which solid rock is exposed. Six sheets are 

 published, dated 1882 and 1883. 



The memoirs issued by the Musee Royal (to which the Survey is 

 now attached) are in two forms, dating from 1877 : — 



' Annales du Musee R. d'Hist. Nat. de Belgique,' in fob, each volume 

 with atlas ; and ' Bulletin,' in 8vo. The former is divided into four series 

 — palaeontology, lithology, stratigraphy, existing fauna. 



Before the establishment of the existing Survey another had been in 

 existence, conducted by a Committee of which M. Jochams was president. 

 It was founded, in 1878, under the control of the ' Ministere de l'in- 

 terieur ; ' this is stated on each publication, which may thus be distinguished 

 from the publications of the existing Survey, the latter being headed ' par 

 ordre du Gouvernement.' 



About 20 maps were published (1879-81), each with text; 18 were 

 by O. v. Ertborn and P. Cogels. Both Surveys have used the same 

 topographical map. 



A general map — ' Carte Geologique dela Belgique, executee par ordre du 

 Gouvernement,' scale 1 \ 160,000 — was prepared by Andre Dumont from 

 1836 to 1854, and was published in 1854. A new issue of this was made 

 in 1877, in two editions — soil and rock, price 40 francs each map. Tbis 

 map was accompanied by Memoirs. Those on the ' Terrains ardennais 

 et rhenan ' were published by Dumont in the Mem. Acad. Roy. Belgique, 

 1847 and 1848 ; those on the ' Terrains cretaces et tertiaires,' prepared 

 by Dumont and edited by M. Mourlon, are published in four vols. 8vo. 

 1878-1882. 



A reduction (not official) of Dnmont's map, scale 1 : 380,000, show- 

 ing the beds below the Hesbayen and Campinien, was published in 1877 

 by Lelorrain and E. Henry. 



Finland. 



Finland's Oeologisha Under •sohiing (Suomenmaan Geologillinen Tuthimus) 



(Helsingfors). 



This survey was commenced in 1865, under the Department of the 

 Administration of Mines, on the scale of 1 : 200,000 ; the director being 

 K. Ad. Moberg. 



