Location is one of the parts of a complete symptom. A reference that lists the curative indications and therapeutic actions of homeopathic medicines. This information is derived from provings and clinical experience. A diathesis based on an infection, its sequellae, or inherited effects. For example, better in a hot bath, abdominal pain better bending over, worse rainy weather, etc.
Modalities are one of the parts of a complete symptom.
Organon - The Organon of Medicine, by Samuel Hahnemann, the founder of homeopathy. This book describes the principles and practice of homeopathy. Hahnemann wrote 6 editions of the Organon from 1810-1842. The sixth edition, though finished in 1842, was not published until 1921. Determined by how many times the remedy has been succussed and diluted during preparation.