Boenninghausen fell ill in April 1833 with a serious intestinal blockage, and was, he felt, on the verge of death when he found almost instant relief in Thuja. He then wrote to Hahnemann about this incident and received a reply dated 28th April 1833. Hahnemann relates that he too had fallen ill on or about 3 April 1833 for 2 weeks from an illness that had threatened his life. He had been saved only by the use of several remedies in a short period of time. What is interesting is that Boenninghausen had also had to use two other remedies, approximately eight days apart, to complete the cure begun by Thuja, and that these were precisely the two remedies Hahnemann had suggested he take not knowing that Boenninghausen had already taken both, each one well-indicated for the case.
In spite of the great care I took, some vexation… may have contributed to my getting a suffocative catarrh, which for seven days before the 10th of April, and for fourteen days afterwards, threatened to choke me …Only since the last four days I feel myself saved. First by smelling twice of Coffea cr. X-o, then of Calcarea; also Ambra contributed its share… I was sorry to hear from all my heart, that you have been so sick … Now if you would have an additional advice for the restoration of the activity of your bowels, I would call your attention to Conium and to Lycopodium, and to take daily walks in the open air. (Boenninghausen, Lesser Writings, p. 205-206)
Boenninghausen at this point in the article comments on Hahnemann’s suggestion of two remedies:
I would add here that a few days after sending off my letter [likely the 15th of April] in which I had neither asked for his advice nor spoken of any additional treatment I had taken the homoeopathically indicated Lycopodium, and so also about eight days before receiving the letter [“first days of May”] from our Hahnemann Conium, each in a minimal and single dose, and nothing else at all… What a mass of observations and of experience was required, together with what a rare divining power, in order to give in advance (in a disease which had only been communicated as to its leading characteristics and as to the mere naming of the first remedy used), two remedies which only subsequently, through their symptoms, were so distinctly and determinedly indicated, as homoeopathically suitable, that of all the other remedies none could come into competition and the result had already proved the correctness of the advice before it had become known to me! (Boenninghausen, Lesser Writings, p. 206)
Absolutely amazing that Hahnemann knew the medicines so well, along with progression of disease that he could tell Boenninghausen what medicines would follow!