TO METEOROLOGY. BY DAVID PURDIE THOMSON, M.D. GRAD. UNIV. EDIN. LICENT. ROY. COLL. OF SURGEONS, EDIN. "Homo, nature minister et interpres, tantum facit et intelligit, quan- LORD BACON,-Nov. Organum, Aph. i. WILLIAM BLACKWOOD AND SONS, EDINBURGH AND LONDON. MDCCCXLIX. |