11. When not being used for growing purposes, bell jars can be decorative accessories. 12. Mrs . Clinton traveled in the city in a virtual bell jar of politeness. 13. I don't have a bell jar with vacuum pump, though. 14. Alltrista Corp ., the Muncie-based maker of Bell jars , jumped 4 . 9 percent. 15. Though she was known for her serious adult writing, including " The Bell Jar ," 16. We put them in a bell jar overnight and allowed them to be slowly moistened, 17. She also wrote " The Bell Jar ", a semi-autobiographical novel published shortly before her death. 18. She later wrote a screenplay adaptation of Sylvia Plath s novel " The Bell Jar ". 19. "Her book is the equivalent of ` The Bell Jar ,'but for this day and age ." 20. Bell jars shield seedlings during the frosty cooler spring months, while allowing light to filter through.