SUCCESSION 269 



or a habitat burned over), a burn succession, tribinm, an erosion succession, 

 etc. A burn succession consists of a sequence of certain formations in one 

 part of the world, and of a series of cjuite different ones, floristically, in 

 another. A particular burn succession should be designated by using the 

 names of a characteristic facies of the initial and ultimate stages in con- 

 nection with the general term, e. g., Bryinn-Picca-pyriunh, etc. A trinomial 

 constructed in this way represents the desirable mean between definition and 

 brevity. Greater definiteness is possible only at the expense of brevity, while 

 to shorten the name would entirely destroy its precision. The following 

 classification of successions is proposed, based upon the plan outlined above. 

 The termination -him (eiov) has been used throughout in the construction 

 of names for successions, largely for reasons of euphony. If it should be- 

 come desirable to distinguish the names of formations and successions by 

 the termination, the locative suffix -on ( -wv ) should be used for the latter. 

 The terms given below would then be hypson, rhyson, hcdon, sphyron, 

 prochoson, pnoon, pagon, trihon, clyson, rcpon, olisthon, xerasion, tlieron, 

 broton, pyron, echallon, caniiion, ochcton, ardon. 



I. Normal successions: cyriodochae (xupios, regular, So)(rj, ^, succession) 

 a Primary successions: protodochae (irpwro^, first, primary) 



1. By elevation: hypsium {v\po<;, to, height, elevation, -aov, place) 



2. By volcanic action: rhysium (^pvaU r], flowing, especially of fire) 



3. In residuary soils: hedium (cSos, t6, a sitting base) 



4. In coUuvial soils: sphyrium {a-^vpov, t6, ankle, talus) 



5. In alluvial soils: prochosium (irpoyuio-L';, fj, a deposition of mud) 



6. In aeolian soils: pnoium (ttvot?, 17, blowing, blast) 



7. In glacial soils: pagium (Trayos, 6, that which becomes solid, i.e., a 



glacier) 



b. Secondary successions: hepodochae (cttw, to follow) 



8. In eroded soils: tribium (TpCfita, wear or rub away) 



9. In flooded soils: clysium (kXv(tk, 6, a drenching, flooding) 



10. By subsidence: repium (pcVw, incline downwards, sink) 



11. In landslips: olisthium (oAicr^os, 6, slip) 



12. In drained and dried out soils: xerasium (irjpaaia, rj, drought) 



13. By animal agencies: therium {6rip, 6, wild animal) 



14. By human agency: brotium (fiporo^, 6, a mortal) 

 a. Burns: pyrium (Trvp, to, fire) 



d. Lumbering: ecballium (iK^dXXo), cut down forests) 



c. Cultivation: camnium (Kdfxvai, cultivate) 



d. Drainage: ochetium (o;)(to's, o, drain) 

 . Irrigation: ardium (ap8<o, irrigate) 



