To suppose that chemistry and poetry are incompatible (as I am sure Prof Donnan would not do!), or that biology is inconsistent with a religious outlook on the world (I don not say with theology!) is to misunderstand entirely what the human mind, by contemplation and experiment, has achieved. By extreme specialization at intervals, by overloading the machine to its limit, discoveries and progress are made: but their bearing is best seen by letting the engine idle and giving oneself time to look around. The chemist and the poet are both right, the biologist and the saint: and each must pull up now and then to find whither he is going and to adjust his spectacles.