Across
- 3. study of Mars
- 6. the science or art of dining
- 7. study of teddy bears
- 8. study of heat
- 11. study of bird's nests
- 12. study of productivity of land
- 14. science or study of grasses
- 15. study of hearing
- 16. study of mites
- 17. science of the origins of government
- 18. study of spiders
- 19. study of influence of stars on people
- 20. study of medical remedies
- 21. the study of first principles
Down
- 1. study of ecology of one species
- 2. study of the atmosphere
- 4. the science of crayfish
- 5. study of truth
- 7. study of bees
- 9. study of extraterrestrial geology
- 10. study of algae
- 12. study of joints
- 13. collecting of air-mail stamps
- 14. study of human material remains
- 17. study of human cultures