Where are the principal data found concerning this remedy ? In Boericke and Dewey's Twelve Tissue Remedies of Schüssler . What is Ferrum phosphoricum ? It is the Ferroso-ferric phosphate , or Phosphate of Iron , one of the so-called twelve tissue remedies. What are the twelve tissue remedies ? Calcarea fluorica, Calcarea sulphurica, Natrum muriaticum, Kali sulphuricum, Kali muriaticum, Natrum sulphuricum, Calcarea phosphorica, Ferrum phosphoricum, Kali phosphoricum, Magnesia phosphorica, Natrum phosphoricum, Silicea. Why are these called the tissue remedies ? They are so called because they are the inorganic cell salts and constituents of the tissues. Hahnemann was the first to make investigations in this line, and gave us provings of some of the salts of Lime, Soda and Potash . Give in brief the biochemic theory of their action. This theory was advanced by Schüssler, a German homoeopathic physician, and consists of the assertion that these twelve remedies are all sufficient to cure any curable disease, and that they act by supplying a sufficient quantity of the proper cell salts to re-establish an equilibrium which has been disturbed ; disease being, according to the same theory, a disturbed equilibrium of the inorganic cell salts. Do Homoeopathists accept this theory ? They do not. The only law of cure known to Homoeopathy is Similia Similibus Curantur . Clinically, however, these remedies have been found most valuable additions to our Materia Medica, and thorough proving of them is necessary. Give the general action of Ferrum phosphoricum. Its field is in all ailments of a hyperaemic or congestive nature, anaemia, etc. Give four characteristic indications of Ferrum phosphoricum that have proved of value.