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Mediate correlation. — Homotyposis .
Variation and the germ-plasm.
Variation of chromosomes corresponding to variation of some.
Variation in relation to its causes.
Extrinsic causes of variation.
Geographical and clematic. — Water. — Food. — Solutions. — Gravity. — Heat. -
Light. — Electricity. — Gther agents.
Intrinsic causes of variation.
Hybridization. — Crafting. — Mutation.
Variation of particular characters.
General laws.
Varietal vs. specific characters.
New vs. old characters.
Secondary sexual characters.
Variation in characters of wide ranging species.
Variation in respect to sexual dimorphism.
Variation in respect to polymorphism.
Secular variation and periodicity.
Natural selection, and other methods of adjustment.
Variation and sexual selection.
Degeneration, retrogressive variation.
Variation in particular groups of plants.
Heredity.
Reproduction.
Philosophy, terminology, etc.
Spontaneous generation and the origin of life. — Artificial protoplasm.
Vegetative propagation.
Fission and fragmentation. — Budding (unicellular). — Gemmae, bulbils, brood-
organs. — Bulbs, tubers, winterbuds (as of Protamogeton), etc. — Gffsets,
runners, etc. — Shedding of branches or other parts. — Vegetative reproduction
in particular species. — Gthers means of vegetative reproduction.
Phys iology and interpretations regarding the clematic history of the earth.
Embryollogy and morphology of fossil plants.
Anatomy.
Stratigraphic, paleobotany of particular geo lo g ic formations a and ages.
Eozoic.
Paleozoic: Cambrian. — Silurian. — Devonian. — Carboniferous.
Cenozoic: Triassic. — Jurassic. — Cretaceous.
Neozoic: Tertiary. — Quaternary. — Modern.
Remains of particular systematic groups.
Succession of dominant groups. Discussions of philogeny and evolution from
paleobotanical data. — Thallophyta. — Bryophyta. — Pteridophyta. — Sper-
maphyta: Pteridospermae ; Oymnospermae ; Angiospermae.
Problematical material of unknown relationship.
Paleobotany of particular geographic regions.
Zoology.
Agriculture.
General.
Farm management.
Farm architecture.
Dictionnaries and cyclopaedias.
Essays, collected addresses, etc.
Periodicals.
Societies, transactions and proceedings.
Study and teaching, agricultural colleges, etc.
Government and state publications.
History.
Soil, its nature and properties, soil geo lo g y .
Soil chemistry.
Tillage (breaking, plowing, subsoiling).
Drainage.
Reclamation.
Irrigation, ground water.
Conservation of moisture.
Drought, rainfall.
Fertilizers.
Goods roads and agriculture.
Insects, plant diseases, weeds.
Beneficial insects. i
Harmful insects.
Affecting plants.
Repression, insecticides, fungicides.
Insect parasites and diseases.
Diseases of agricultural plants.
Weeds.
Poisonous plants.
Field crops.
Grain crops or cereals. — Rice. — Cotton. — Fiber crops. — Alkaloidal plants
(tobacco, tea, coffee, cocoa, poppy). — Forage crops. — Grasses. — Forage
crops. — Legumes. — Root crops used as field crops. — Sugar-yielding plants.
Horticulture.
General.
Culture. — Germination. — Propagation. — Planting and transplanting. — Training,
cutting, pruning and minor treatment. — Spraying and treatment for insects
and diseases. — Protection from weeds and poisonous plants. — Forcing.
Plant breeding (See 5751.078 and 5811.6637): Acclimatization. — Crossing and hybridizing.
— Selection.
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