2 
Morphology =0207 — - 
General 
Histology 
Tegument- and special glands 
Skeleton 
Nervous system, Sense-organs 
Myology 
Alimentary system, Blood . . 
Respiratory system. . 
Physiology =0211 — 
General 
Cytological. Protoplasm and cell 
Sex 
Parthenogenesis 
Metabolic. Metamorphosis 
Function 
Environment, Adaptation . . 
Regeneration 
Senescence, Death . . 
Chemical 
Development =0215 — 
General 
Ovum, oogenesis 
Spermatozoon, spermatogenesis 
Embryology. Organogeny 
Fertilization . 
Experimental embryology , . 
Ethology =02 19 — 
General 
Phenology . . 
Parental 
Sexual 
Social 
Parasitism 
Voice. . 
Habitat 
Speleology 
Movement . . 
Psychology 
Colour. Defensive processes 
Aetiology and Variation =0223 — 
General 
Variation 
Mutation 
Teratology . . 
Heredity — 
General 
Mendelian 
Special cases 
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