In order to pursue a study of the character here indicated it is necessary to have recourse to much 
information derived from other sciences. An appeal must be made to the geologist and geomorphologist 
for many facts regarding the structure and formation of the surface of the earth ;from the metallurgist 
and the mining engineer must be obtained some knowledge of the value of minerals and fuels accessible 
to man;the general principles determining climate must be accepted from the meteorologist; while the 
botanist and the agricultural chemist must supply the necessary infotmation regarding plant life.