Possible Clues:

• French chemist late on his way back
• Chemist with dough went to ancient city
• French chemist, 1822-95
• Show regret over following former chemist
• A purest form of milk results from his work
• Spoken caprice of Sayers
• Chemist finding europium in foreign parts
• Louis —, French chemist/bacteriologist
• 1936 Oscar-winning title role for Paul Muni
• Disprover of spontaneous generation