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In Chemistry research of this kind has been undertaken only casually and over small portions of the field. Franz Wald is one of the independents who has been working along this line for many years. General appreciation of the fundamental character of such investigation extends very slowly indeed. Three years ago, on the occasion of the Faraday lecture, I made an attempt to arouse the interest of chemists in these matters, but the result was not very encouraging. But few expressions of opinion were offered on this occasion, and these were largely contradictory in nature. It was quite evident that the question at issue was not clearly understood, and the entire matter was strange, even to chemists of note. But I know from personal experience that patient and continued labour can accomplish wonders even when the case seems hopeless. One must wait for the right time, and I am convinced that the time for this matter has arrived.
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