The true master of the art of teaching will vary his method too, he tells us according to the _subject_ which he handles,--and the reader should note particularly the illustration of this position, the instance of this general necessity, which the author selects for the sake of pointing his meaning here, for it is here--precisely here--that we begin to touch the heart of that new method which the new science itself prescribed,--'the true teacher will vary his method according to the subject which he handles,' for there is a great difference in the delivery of _mathematics_, which are the most abstracted of sciences, and POLICY, which is the _most immersed_, and the opinion that 'uniformity of method, in multiformity of matter, is necessary,' has proved very hurtful to learning, for it tends to reduce learning to certain _empty_ and _barren_--note it,--_barren_-- 'generalities;'--(so important is the method as _that_; that it makes the difference between the fruitful and the barren, between the old and the new) 'being but the very _husks_ and _shells_ of sciences, all the _kernel_ being forced out and expressed with the torture and press of the method; and, _therefore_, as I did allow well of _particular topics_ for invention'--_therefore_--his science requires him to go into particulars, and as the necessary consequence of that, it requires freedom--_'therefore'_--as I did allow well of particular _topics of invention, 'so_ do I allow likewise of _particular methods of tradition_.' Elsewhere,--in his Novum Organum--he quotes the scientific outlines and divisions of this very book, he quotes the very draught and outline of the new human science, which is the principal thing in it, and tells us plainly that he is perfectly aware that those new divisions, those essential differences, those true and radical forms in nature, which he has introduced here, in his doctrine of _human_ nature, will have no practical effect at all, as they are exhibited _here_; because they _are_ exhibited in this method which he is here criticising, that is, in empty and barren abstractions,-- because it was impossible for him to produce here anything but the _husks_ and _shells_ of that principal science, all the kernel being forced out and expulsed with the torture and press of the method. But, at the same time, he gives us to understand, that these same shells and husks may be found in another place, with the kernels and _nuts_ in them, and that he has not taken so much pains to let us see in so many places, what new forms of delivery the new philosophy will require, merely for the sake of letting us see, at the same time, that when it came to _practice_, he himself stood by the old ones, and contented himself with barren abstractions, and generalities, the husks and shells of sciences, instead of aiming at particulars, and availing himself of these '_particular methods of tradition_.'