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Alternation. 

 Formational ecology. 

 General, philosophy, classification, etc. 

 Physiognomy and aspect in gênerai. 



Factors which détermine the occurence and extent of formations. 

 Forests formations. — Tropical rainy. — Monsoon. — Temperate rainy. — Deci- 

 duous or hardwood. — Savanna. — Sclerophyll. — Thorny. — Other forest 

 formations. 

 Prairie formations. 

 Désert and semi-desert formations. 

 General.— Alkali lands. — Chaparral, gerique. — Cold désert, tundra. — Strand. — 



Dunes. — Marsh formation. 

 General. — Boge and high moor. — Heath. — Fresh marsh and low moors. — Sait 



marsh. Aquatic formations. 

 General. — Running water. — Freshwater benthos. — Saltwater benthos. ~ Pleuston. 



— Freshwater plankton. — Saltwater plankton. — Snow and ice formations. 



— Other formations. — River bluff, serpentine, lichen, etc. 



Synoekology of particular régions. 

 Phenology. 



Floristics and floral régions. 

 General .— Floral régions and their délimitation. — Cosmopolitanism. — Ende- 

 mism. — Barriers. — Polykylesis. — Adventive plants. — Statistical floristics. 



— Floras .— Floristic notes on particular régions. 

 Symbiosis. — Mycorhiza. — Helostism. — Parasitism. 



Sexual cell unione. — Other cell fusions. 

 Reproduction. Cell division. 

 Nuclear division. 

 Direct division, amitosis. 

 Mitosis or karyokinesis. 

 Dynamic of nuclear division. 



Artificial mitosis, i. e. mechanical or other imitations of mitotic division. 

 Nuclear division in particular groups. 

 Segmentation of protoplasm. Méthode of cell multiplication. 

 Cleavage by constriction or furrows. 

 Cleavage by cell plate. 



Frec cell formation. Simultaneous formation of several cells. 

 Budding. 

 Cell activities at critical periods of ontony. 



Zoospore formation. - Spermatogenesis. — Oogenesis. — Sporogenesis. — Ré- 

 duction of chromosomes, synapsis, maturation. — Apogamy. — Apospory. 

 Myrmecophily. — Other relations with animais. — Other spécial relations. 



Ethnobotany. 



Economie plants of aborigines and ancients. 



Historié plants. 



Plants of art and literature. 



