154 
The WorTc of the Geological Survey. 
headquarters. The specimens are then unpacked and treated by the 
paleontologists or petrographers, as the case may be, in the manner 
already indicated. 
Y. Preparation of Maps, Sections, and Memoirs for 
Publication. 
The results obtained by the Geological Survey are made public 
in three forms — Maps, Sections, and Memoirs ; to which may be 
added the arrangement of specimens in the three museums, with 
their diagrams, handbooks, and other explanatory matter, and also 
the original papers, which lying often beyond the scope of the 
Survey’s publications, are prepared by members of the staff and, 
with the consent of the Director-General, are communicated by 
them to scientific societies or journals. 
(a) Maps . — Every surveying officer is responsible for keeping his 
6-inch field-maps inked-in and coloured-up, so that if required to 
be exchanged with his colleagues they shall be clear and intelligible. 
He is likewise required to prepare duplicate copies of these field- 
maps, which when completed are transmitted to the office and are 
kept there for consultation by the public. 
As already stated, 6-inch maps of some of the mineral-fields 
have been published. These have been prepared by the officers who 
surveyed them, the geological work being put on a dry impression 
from the plate of the Ordnance map, which is then sent to the 
Ordnance Office to be transferred to an electrotype of the plate. In 
a few cases, also, maps on this scale, where the geology is of special 
interest or complexity, have been prepared and published. But for 
the country at large it is not desirable to publish maps on so large 
a scale as that of 6 inches to a mile. Over all the counties which 
have been surveyed on that scale, MS. copies of the 6-inch maps 
can be obtained by the public at the mere cost of manual transcrip- 
tion from the duplicate copies retained in the office. 
The work surveyed by an officer on the 6 -inch scale is reduced 
by him upon a dry impression of the 1-inch Ordnance map. A single 
1-inch sheet may comprise the work of half a dozen surveyors, and 
in that case the sheet is passed from one to another, each adding his 
own share. The completed dry proof is then checked at the office, 
and is sent to the Ordnance Survey to be engraved on an electrotype 
copperplate specially prepared for the purpose from the original 
Ordnance plate. After the final corrections have been made in the 
engraved map and the scheme of signs and colours has been engraved 
on the margin, a copy of this map is coloured as it is to appear on 
publication, each surveyor again taking the portion for which he is 
personally responsible. The scrutiny involved in this process serves 
generally to detect any errors that may have previously escaped 
notice. This original coloured copy remains as the standard to 
which all subsequent copies of the same edition of the map are made 
to conform. 
