    Sentence 1: What was the occupation: of  Joseph Priestley?    Sentence 2: In the meantime, on August  4, 1774, an experiment conducted by the  British . clergyman: Joseph Priestley  focused ‘sunlight -on mercuric“ oxide  gO) inside’ a. glass tube, which  berated: a jas he named.  'dephlogisticated air".                 