160 
The Work of the Geological Survey. 
incomplete and difficult of consultation if it were left in this dis- 
seminated state. It needs to be gathered together, arranged, and 
put into connected form, so as to present an intelligible account of 
the geology and mineral products of these islands. The task is a 
heavy one, and cannot be speedily finished. But satisfactory progress 
is being made. We have published a Monograph on the Pliocene 
deposits of England, and two volumes of another on the Jurassic 
rocks, while a third volume is in the press. Another Monograph on 
the Cretaceous rocks is in preparation. Each monograph will 
embrace one system or group of rocks, and may consist of a number 
of volumes, according to the importance of the system and the area 
which it occupies in the country. 
In the preparation of the Memoirs, and for museum purposes, 
much assistance is now derived from photography. Several 
members of the staff have become expert photographers, and a large 
number of views of geological sections, coast-cliffs, and other 
natural or artificial exposures of rock, have been taken. These serve 
as illustrations for the Memoirs, and some of them are mounted to 
accompany the specimens in the museums. 
Besides the geological Memoirs, the Survey has published a series 
of Decades of British organic remains, with plates and descriptions, 
also Monographs of important genera or groups of fossils. 
VI. Museum Work. 
For the complete illustration of the geology of a country it is 
necessary not only to construct geological maps and sections, and to 
publish printed descriptions, but also to collect and exhibit speci- 
mens of its minerals, rocks, and organic remains. Each branch of 
the Geological Survey has from the beginning kept in view the 
gathering of such specimens, and the galleries of the museums in 
London, Edinburgh, and Dublin may be appealed to as evidence of 
the manner in which the duty has been discharged. 
The Museum in Jermyn Street is intended to be primarily illus- 
trative of the minerals, rocks, and fossils of England and Wales, 
but as far as space will admit an endeavour is made to exhibit what 
is specially characteristic of the other two kingdoms. For the more 
detailed illustrations of Scottish geology recourse must be had to the 
Museum at Edinburgh, and for those of Irish geology to the Museum 
in Dublin. 
The portions of the Jermyn Street Museum more especially 
connected with the work of the Survey are the collection of fossils, 
the series of rock-specimens, and the remarkably fine and complete 
suite of ores and their accompaniments from the mines of the 
British Isles and those of the Colonies. The Museum was organised 
to illustrate the practical applications of geology. As an example 
of the manner in which this design has been carried out, I may refer 
to the section in which the connection between raw material and 
finished pottery is displayed. The British ceramic collection was 
