Initially we must identify the substance under discussion. The preparation used by Dr Foubister and Dr Templeton in clinical practice and in trials, was the original preparation of Careinosin, the source of which is unknown. It was brought over from the United States and was probably prepared from an epithelioma of breast. A number of different specimens obtained from the operating theatre of the Royal London Homoeopathic Hospital are now available in potency. They are following:

1. Carcinosin ADENO STOM.  : from an epithelioma of the stomach. 
2. Carcinosin ADENO VESICA : from an epithelioma of the bladder.
3. Carcmosm INTEST. CO. : from epitheliomata of the intestine and of the bladder.
4. Caremosln SCIR. MAM. : from a scirrhus of the breast.
5. Carcinosin SQUAM. PULM. : from an epithelioma of the lung.