XXI. On Sir H. Davy’s Safe-Lamp. By Dr. Urb, M.D.Professor of Chemistry,To Mr. Tilloch.Dear Sir, — Permit me to join my voice, to the decisive testimonies already published, in favour of Sir H. Davy’s safety-lamp. I was lately present at several experiments, which place in a con-cm ntmno im Attf n»i 171 vi