I have procured air [oxygen] ... between five and six times as good as the best common air that I have ever met with. — Joseph Priestley Copy Share Image
![“I have procured air [oxygen] ... between five and six times as good as the best common air that I have ever met with.” quote by Joseph Priestley](https://sms4smile.com/quotes/img-quotes/1b7/joseph-priestley-17782_air_i-have-procured-air-oxygen-between-five_1664472.jpg)