Chemical Combinations. ¸ rnercial prosperity, which, we trust, this city is destined to run. By estab. lishing a permanent tide observatory, with a provision for the regular reduction of the observations, and the consequent constant improvement of tide tables, Bristol would render a greater service to science than any city has ever yet rendered. ~raut. ~. Of Chemical Combinations, produced in virtue of the presenee of Bodies which remain to continue the process. By Mn. Exr.Er.