INTRODUCTION 



548 Crystallography. 



549 Mineralogy. 



55 Geology. 



550 Form divisions [see Table B]. 



55(-) Eegional geology. 



[divided as in Table C (2) to (9)]. 



55 : Relation divisions. 



551 Physical geology. 



5511 General structure of globe. 



5512 Seismology. 



5513 Erosion and Deposition. 



5514 Physical geography. 



55141 Continents. 



55142 Islands. 



55143 Mountains. 



55144 Caves. 



55145 Plains. 



55146 Oceans. 



-551461 Atlantic. 



[etc. as in Table C (26)]. 



55148 Fresh waters. 



'5515 Meteorology. 



-55151 Winds. 



-55152 Temperature. 



-55154 Pressure. 



55156 Climate. 



55157 Moisture. 



5 5 1 5 9 Practical Meteorology. 



5 5 1 6 Metamorphism. 



-5517 Stratigraphical geology [cf. Table G (11)]. 



'55171 Archean, Azoic. 



55172 Primary, Palaeozoic. 



551721 Cambrian 



'55 I 73 Silurian 



55174 Devonian 



55175 Carboniferous, Permian. 



14 



