Home › Articles › FFF – THE GUIDING SYMPTOMS OF OUR MATERIA MEDICA By CONSTANTINE HERING, M.D. Print ← Back to Articles Article FFF – THE GUIDING SYMPTOMS OF OUR MATERIA MEDICA By CONSTANTINE HERING, M.D. Ferr. Ferr. i. Ferr. m. Ferr. p. Ferr. s. Fil. Fl. ac. Form. Ferrum (Ferrum Metallicum) —– Ferr. Ferrum Iodatum —– Ferr. i. Ferrum Muriaticum —– Ferr. m. Ferrum Phosphoricum —– Ferr. p. Ferrum Sulphuricum —– Ferr. s. Filix Mas —– Fil. Fluoricum Acidum —– Fl. ac. Formica Rufa —– Form. ® 2002