D O C U M E N T 3 4 1 D E C E M B E R 1 9 2 8 3 2 5 341. To Chaim Herman Müntz [Berlin?,] 18 December [1928] Dear Mr. Müntz, After I had carefully written out the whole affair,[1] I saw that I had deceived my- self at a decisive point. The equations are in fact useless, even in the first approxi- mation. This disordered approach does not carry us along a clear path. We shall have to take up our old Hamilton method once again, even though it is a difficult one.[2] The question is then whether the Hamilton function for really leads to an underdetermination, as we know to be true for the first approximation and for the centrally symmetric case. If this is indeed true, i.e., if there is a second fourfold identity in this special case, then the true field equations will be given by: lim Best wishes for a good recovery and happy holidays from your A. Einstein 342. Declaration against Chemical and Bacteriological Warfare[1] [Einstein 1930d] Dated after 19 December 1928[2] Published 1930 In: Chemical Warfare: An Abridged Report of Papers Read at an International Conference at Frankfurt am Main, 1929, Called by the Women’s International League for Peace and Freedom. London: Williams and Norgate, 1930, pp. 83–85. [See documentary edition for English text.] h J 1 J 2 – 1 = 1 = d H 0 =