One of the homeopathy crowning achievement is the use of "patient's own expressions" for the selection of an accurate similimum. Subjective Symptoms, as these are called, have been found to etremely valuable in clinical practice.
Although these symptoms were found scaltered in "homeopathic repertories", there was hardly any authoritive work on them till the publication of this one.
For this work Roberts drew information from an interleaved copy of Holcomb's work that was compiled by Dr. W.A. Yingling, as well as from the work of Hering, Clarke and Allen.