214 THE NEW WORLD OF SCIENCE 



(c). Electrical problems so far as controlled by the condition of 

 the ground with reference to earthing, erecting masts and bury- 

 ing cables. 



(d). Advice on the locating of roads, field railways, light rail- 

 ways, cable tram-lines, with a view to avoiding cutting and em- 

 bankment slides. 



(e). Appreciation of suitable sites for dams. 



V. Other Military Problems. 



(a). Careful observation of the structure of the substrata 

 (nature, solidity, water-content) for standing camps, 

 (b). Choice of dry substrata for munition dumps, 

 (c). Choice of suitable natural solid surfaces for heavy guns, 

 (d). Choice of spots naturally fitted for aerodromes. 

 7. The function of the Geologist is only advisory. It is not his 

 province to see to the technical development of propositions by 

 elaborating them from plans or by actual superintendence of the 

 work. 



Signed WEIGEL, 

 Reserve Lieutenant, 

 Commander of the Geological Section of the Fifth Army. 



Among other documents captured from the Germans were 

 water-supply and geological maps of various types, prepared 

 at the front by the German geologists. Some of the maps, 

 particularly those showing aerial geology, were very detailed, 

 printed in colors, and accompanied by cross-sections in colors. 

 Such maps were prepared for each army corps area, and addi- 

 tional detailed maps were printed for smaller areas of special 

 importance. Both types of maps were executed with much 

 care. Instead of being mere enlargements of the previously 

 existing French maps (which were often old and inaccurate) 

 both the topography and the geology were resurveyed, and the 

 results were more accurate and detailed than the data shown 

 on previous maps. 



The German geologists endeavored to make their reports and 

 maps as untechnical and as practically useful as possible. The 

 descriptions of formations and explanations of structure were 



