50 SCIENCE IN AFRICA 



on 1 :250,ooo, i : 1 25,000, and 1 162,500; the combined area covered 

 represents about 80 per cent of the country, but of this 21 per 

 cent was done before the war and is now seriously out of date. 

 During the depression the topographical branch was cut down to 

 a mere nucleus and very little new survey — apart from revision — 

 has been done. The department considers that it is not advisable 

 to undertake further topographical work in the Northern Terri- 

 tories until the possibility of air survey has been investigated (see 

 page 58) . In 1 935 the Survey Department published a useful atlas of 

 the Gold Coast including fourteen maps of the whole territory on 

 a scale of i :500,ooo, showing geographic data such as relief, 

 geology, population, rainfall, forests, products, etc. 



Sierra Leone has been topographically surveyed on 1 162,500 by 

 the local Survey Department, but so far only about half of the 

 sheets have been printed. The War Office 1 1500,000 map is based 

 on this survey, but contours are not shown. 



For the Gambia, which has only a Lands Department, the only 

 general maps are the War Office publications on 1:500,000 and 

 1:250,000. 



Somaliland has no Survey Department. The only maps are War 

 Office publications on i : 1,000,000 and i :250,ooo. The latter, much 

 out of date, will be superseded by a new series now in preparation. 



The Anglo-Egyptian Sudan Survey Department pubhshes a com- * 

 piled 1 :250,ooo series which is systematically revised as new data 

 accumulate. It publishes also International 1:1,000,000 sheets. 



Egypt 



The seven sheets of the International one million map which 

 cover Egypt were completed in 1934. In addition to these the 

 whole country is covered by a provisional i :500,ooo which 

 soon will be superseded by a better series. Lower Egypt, the Nile 

 to Aswan, the Red Sea Coast, the Northern Littoral and the whole 

 Peninsula of Sinai on the 1:100,000 scale, and nearly all Lower 

 Egypt, some of the oases and part of the Nile are topographically 

 mapped on i : 25,000. All these maps were produced in Egypt. For 

 Northern and Central Sinai the War Office i :250,ooo and i : 1 25,000 

 series are still the only contoured maps, but these are being replaced 

 by a new series produced in Egypt. 



