- In Paris he left the world all full of matter; here he finds absolute vacua. - "The Approach to Philosophy", Ralph Barton Perry.
- Now, however, that he had found means for obtaining and maintaining high vacua, Edison immediately went back to carbon, which from the first he had conceived of as the ideal substance for a burner. - "Edison, His Life and Inventions", Frank Lewis Dyer and Thomas Commerford Martin.
- Patior facile injuriam, si vacua est contumelia. - "DÃ¶derlein's Hand-book of Latin Synonymes", Ludwig DÃ¶derlein Commentator: S. H. Taylor.