SUCCESSION 269 
or a habitat burned over), a burn succession, ¢ribium, 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 quite 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., Bryum-Picea-pyrium, 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 -ium (éov) 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 (-év ) should be used for the latter. 
The terms given below would then be hypson, rhyson, hedon, sphyron, 
prochoson, pnoon, pagon, tribon, clyson, repon, olisthon, xerasion, theron, 
broton, pyron, ecballon, camnon, ocheton, ardon. 
I. Normal successions: cyriodochae (xpos, regular, Sox7, 9, succession) 
a Primary successions: protodochae (mpéros, first, primary) 
1. By elevation: hypsium (twos, ro, height, elevation, -efov, place) 
2. By volcanic action: rhysium (fvois ¥, flowing, especially of fire) 
3. In residuaty soils: hedium (0s, 7d, a sitting base) 
4. In colluvial soils: sphyrium (c¢vpov, 7d, ankle, talus) 
5. In alluvial soils: prochosium (xpéxwous, 9, a deposition of mud) 
6. In aeolian soils: pnoium (voy, 4, blowing, blast) 
7. In glacial soils: pagium (adyos, 6, that which becomes solid, i.e., a 
glacier) 
b. Secondary successions: hepodochae (érw, to follow) 
8. In eroded soils: tribium (tpé8w, wear or rub away) 
g. In flooded soils: clysium («Avois, 6, a drenching, flooding) 
to. By subsidence: repium (fére, incline downwards, sink) 
tr. In landslips: olisthium (6dt6os, 6, slip) 
12. In drained and dried out soils: xerasium (€ypacfa, 9, drought) 
13. By animal agencies: therium (@%p, 6, wild animal) 
14. By human agency: brotium (Bpords, 6, a mortal) 
a. Burns: pyrium (wip, 76, fire) 
4. Lumbering: ecballium (é«BéAdAw, cut down forests) 
ce. Cultivation: camnium (xdpre, cultivate) 
d. Drainage: ochetium (éxerds, 6, drain) 
e. Irrigation: ardium (dpéo, irrigate) 
