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  1. The Sphere. Solids Inscribed in the Sphere

  2. The Visual Analyzer

  3. Motion within the gravitational field. Motion within an uneven gravitational field

  4. The oak and related plants

  5. The temperature. Measuring methods.

  6. The hygiene of the locomotory apparatus

  7. Physical methods for purifying substances

  8. Multiplication of natural numbers

  9. Chemical phenomena and properties

  10. The cabbage and related plants