To enable us to understand his decision, he describes for us the four years of daily struggle which had been his lot in Germany before he made up his mind to leave.--Notwithstanding his views on the war, when it actually broke out he put himself at the disposal of the military authorities, but only as a civilian medical man (vertraglich verpflichteter Zivilarzt). He was appointed principal medical officer in the new Tempelhof hospital, a post which permitted him to continue his public lectures at the university of Berlin. But in October, 1914, in conjunction with Professor W. Foerster, Professor A. Einstein, and Dr. Buek, he issued a protest, couched in very strong terms, against the notorious manifesto of the 93. Punishment did not tarry. He was at once relieved of his post, and was appointed medical assistant at the isolation hospital in the little fortress of Graudenz. Being under no illusions as to the reasons for this arbitrary and absurd measure, he devoted his spare time to the preparation of his book, _The Biology of War_. Now came the sinking of the Lusitania, which was a terrible shock to Nicolai, affecting him as if he had been struck with a whip. At dinner with a few of his comrades, he declared that the violation of Belgian neutrality, the use of poison gas, and the torpedoing of merchantmen, were not merely immoral actions, but were acts of incredible stupidity, which would sooner or later ruin the German empire. One of those present, his colleague Dr. Knoll, could find nothing better to do than to inform against him. Anew dismissed from his post, Nicolai was sent in disgrace to one of the most out-of-the-way corners of Germany. He protested in the name of justice. He appealed to the emperor. The latter, he was given to understand, wrote on the margin of the report of his case: "Der Mann ist ein Idealist, man soll ihn gewähren lassen!" (The man is an idealist. Let him alone!)