ee G.b.19 
[G. be] 19. Electricity mechanical agents, chemicals effects of. 
20. Phytohormones. 
Ge Ecologys general, including texts, treatises on methods. 
9 gah eae | 
1, Regional and local ecologies (except as in 2-9). L Steet ¢ «2 
- 
{ 
2e Alpine, arctic and mountain vegetation. Migh on Pr, A 1) { 
3. Tropical vegetation and epiphytes. | 
4. Plankton, aquatics, swamp and bog vegetation, ice plants, 
dew plants, cave plants, etc. 
5. Forest ecology. 
~ 
6- Pheological: observations and data on climate in relation 
to plants (without pplication to specific formations). 
7° ) Associations, formations and societies, general enumeration, 
succession, colonization. 
8. Adjustment to habitat, general acclimatization phenomena. 
el Protective devices. 
9, Halophytes, Xerophytes, vegetation of beaches, dunes and 
deserts. 
10. Climbing plants. 
ll. Carnivorous plants. 
12. Parasitism (other than fungous) and sapenghytlons symbiosis, 
myrmecophitism, etce, general relations (not phytopathological). 
13. Dissemination of seeds and other propagative structures, 
mechanics of plant distribution. 
14, Wind action and effect of fire. 
15. Special ecology of organs (including effects of factors not 
, referable to x, 3, ie, 17, 18, 19, etcese 
© 86.1 Roots and rhizoids. 
«2 Stems and appendages, prickles, etce (dormant buds). 
°3 Leaves 
«4 Flowers, fruits and seeds (exclusive of pollination and 
distribution). 
