2 
Development =021 5 — 
General 
Ovum, oogenesis 
Spermatozoon, spermatogenesis 
Embryology. Metamorphosis 
Ethology =0219 — 
General 
Migration, Flight . . 
Social . • . . . . 
Luminosity . . 
Oceanic, Plankton general . . 
Psychology, Tropisms 
Aetiology and Variation =0223 — 
General 
Variation, Mutation. . 
Heredity 
Evolution. - Origin of species 
Phylogeny . . 
Geography =0227 — 
General 
Faunae : — 
Ocean 
Europe and Mediterranean 
Asia, Malay Archipelago 
Africa 
North America 
South America, etc. 
Australasia 
Arctic 
Taxonomy (or Systematic) =0231 
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