Surveying and Mapping British Guiana. 59 
Brought forward A rite 7,891 
Additional for boathands bringing up stores from 
Georgetown and extra labour required, say .. - 1,709 
$ 9,60 
The cost of the necessary boats, and tackling, tarpaulins, etc., can be put 
at an average of $300 for each party per year. 
The surveying instruments required would probably cost for the whole work 
say $10,000, and a similar sum might be allowed for the cost of the permanent 
marks on the main river traverses. 
The Surveyors when in Georgetown would occupy their time in plotting 
their field work, but provision would have to be made as well as for a competent 
draughtsman to carry on the preparation of the maps continuously and con- 
currently with the field work. 
For the astronomical work, a separate party similar to that for survery work 
above the Falls will be required. This party, working from North to South 
for 180 actual field days per annum, would, I consider, be able in three years 
to cover the Colony with a net work of main and secondary observation sta- 
tions. The Surveyors comprising this party should have a knowledge of 
Geology, and geological collections and observations could be made by them 
along the routes they travelled. 
Maps drawn to two scales would be necessary. A large map in sections of 
say 3 feet square, to a scale of one inch to the mile anda . wall map drawn to 
a scale of 10 miles to the inch. The large scale map would be prepared first 
and each section might be published as soon as completed. The wall map 
would be reduced from the large scale map. 
Summary OF Cost. 
Field Work.— 
6 Survey parties with boats, etc., for 2 years at $7,500 
each perannum .. . $ 90,000 
6 Survey parties with oats. sit oe 3 years Hy $9, 900 
each perannum .. ; 178,200 
1 Observation party for 3 years ae $10, 000 per annum. 30,000 
Cost of Surveying Instruments, say ac 36 Es 10,000 
Cost of permanent Marks, say .. rs ag he 10,000 
Office Work.— 
Draughtsman, Assistant, and agate say, $2,500 
per annum for 6 years ‘ 15,000 
Lithographing and Printing 1 ,000 copies of each sec- 
tional Map and 1,000 eaves of Wall ee and Contin- 
gencies, say ot : 56 26,800 
$360,000 
