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enough strength to travel, Haber drove to the Swiss sanatorium in Mammern. Here, his physical condition was
under constant medical supervision. A quite remarkable thing also occurred during his stay at the sanatorium.
Haber composed a letter on October 3, 1933, in English which he sent to the Paris representative of the
Rockefeller Foundation – a former supporter of his institute – “that a new Nazi-appointed
director of the institute
was likely „to study chemical warfare with the Institute…. You will remember that in was time I have been the
leader of the chemical warfare in Germany and that I have been proud to work for the military authorities with
the institute as an experimental basis. But after the Armistice, I have cancelled every such work and fully
declined to renew it in whatever form.‟”
18
Clearly Haber would have known that the work on chemical weapons had not completely ceased when
he left his position at the institute (they were in fact still further developing the Zyklon cycle). Was he simply
trying to acquit himself of any possible future accusations about his involvement with chemical weapons? He
was after all beginning a new life in a way, away from his home and his institute. Perhaps he simply wished for a
clean slate. Or did he have other intentions, realizing that the research which he had been working on should not
be continued, and trying to find a way to stop its continuation in his absence? His exact reasons will never be
known, though, for no letters in response to this letter have ever been discovered.
After a few months, by the end of October, Haber once again visited his son in Paris and then he began
the journey to his new home in England. Once secured at his new position, and despite his continuously
weakening condition, Haber created another great circle of scholars ad scientists, as he had done years before in
Dahlem. One colleague of his later described an experience he had had while visiting Haber in Cambridge:
On 15 December I traveled to London in order to settle various matters, and naturally I visited
Haber in Cambridge. There I experienced some unforgettable hours. In the afternoon we
gathered for a scientific colloquium in his hotel room in Cambridge; all his laboratory assistants
from Dahlem were there, and I was there as a guest, along with a friend I had brought from
London. Then began a scientific discussion more wonderful than you could possible imagine.
All cares, all difficulties, all pressures were forgotten in that moment. And so the Dahlem circle
arose anew under Haber‟s influence in Cambridge, unfortunately only for a short time.
19
These times, working with scientists again and feeling useful, must have been a great comfort for Haber.
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Yet nothing could stop his body from quickly decaying into a state of even more serious illness. He began to
suffer “exactly the same sort of attack [as in Brig] but slightly weaker.”
20
By the winter he knew he had to travel
south to help ease his sick pains. When leaving Cambridge after only two months, he wanted to be sure to
express his immense gratitude, and wrote to the vice chancellor of the university stating that:
In these weeks I have learned that in this country, where the memories of ages past do not fade,
the chivalry from King Authur‟s time still lives among its scientists…. I have the strong hope
that I will be able to return in a few weeks. I feel the uncertainty of the future like a physical
weight on my old shoulders, and I am sure that the odss are imponderable whether my physicals
strength will suffice to bear the coming earthquakes.
21
On January 26, Haber travelled to London, and from there he would travel in Paris. In London, he
stopped to visit Chaim Weizmann, who commented later that Haber was “still overflowing with spirit and turned
the conversation into a real experience.” This visit took place only forty-eight hours before Haber passed-away,
for right after speaking with Weizmann; Haber continued to travel to Switzerland. When he arrived, he was
greeted by his son Hermann and by Rudolph Stern. Both men were appalled at the condition in which Haber
appeared before them. Stern reported that:
He was not capable of speaking for even a few minutes without having a severe heart attack. He
agreed to go to bed and asked me to examine him thoroughly. As I have always done, I
reassured him with calming words and promised him that the weeks in Orselina [where Haber
wanted to go] would do him good. He always reacted to this psychological treatment with
amazing gaiety. Nothing could keep him in bed any longer. He got up and came downstairs and
– almost without pausing – discussed future plans for his son and himself. Each of us had a
chance to talk to him alone, and he showed great interest in everything we told him. I insisted
that we all retire early, and we said good night with plans for the next morning.
But hardly had we separated than he called me to his room. He had a sudden heart flutter
related to pulmonary edema. I asked Professor [Rudolp] Staehelin, the leading heart specialist in
Basel, to come for a consultation, and he immediately appeared at the hotel. Together, we tried
everything until his heart no longer responded to our medical efforts. He never returned to