22
1. deglutition 2. reconnoitre 3. pleonasm 4. boomerang 5. fulness 6. necessity 7. lacteal 8. calla-lily 9. deify 10. encouragement 11. barbecue 12. centripetal 13. incidence 14. gelatine 15. aide-de-camp 16. calliope 17. encyclopædia 18. fragilely 19. delectable 20. illusion 21. galoche 22. accretion 23. japanning 24. boreal 25. frangibility 26. morphine 27. philippic 28. rattling 29. galvanize 30. philology