Dr. Hering thus describes it: "After he had lectured to his fellow-workers on the rules of proving, he handed them the bottles with the tincture; and when they afterwards brought him their day books, he examined every prover carefully about every particular symptom, continually calling attention to the necessary accuracy in expressing the kind of feeling, the pain or the locality, the observation and mentioning of everything that influenced their feelings, the time of day, etc. When handing their papers to him, after they had been cross-examined, they had to affirm that it was the truth, and nothing but the truth, to the best of their knowledge, by offering their hands to him - the customary pledge at the universities of Germany, instead of an oath. This was the way in which our master built up his Materia Medica".

For fuller study see Organon, § 105 to 145.

Dudgeon, Lectures on Homoeopathy, page 176. Lecture VII and VIII.

Sharp's Tracts on Homoeopathy, Essay VII. Provingsin Health.

Dunham, Science of Therapeutics: The Dose in Drug Proving, page 136. Directions for Drug Provers, page 350.