of human knowledge, and to write out chapters, books, passages, sketches, designed to take their places in it as essential parts.  It was to include six great divisions:  first, a general survey of existing knowledge; second, a guide to the use of the intellect in research, purging it of sources of error, and furnishing it with the new instrument of inductive logic by which all the laws of nature might be ascertained; third, a structure of the phenomena of nature, included in one hundred and thirty particular branches of natural history, as the materials for the new logic; fourth, a series of types and models of the entire mental process of discovering truth, “selecting various and remarkable instances”; fifth, specimens of the new philosophy, or anticipations of its results, in fragmentary contributions to the sixth and crowning division, which was to set forth the new philosophy in its completeness, comprehending the truths to be discovered by a perfected instrument of reasoning, in interpreting all the phenomena of the world.  Well aware that the scheme, especially in its concluding part, was far beyond the power and time of any one man, he yet hoped to be the architect of the final edifice of science, by drawing its plans and making them intelligible, leaving their perfect execution to an intellectual world which could not fail to be moved to its supreme effort by a comprehension of the work before it.  The ‘Novum Organum,’ itself but a fragment of the second division of the ‘Instauration,’ the key to the use of the intellect in the discovery of truth, was published in Latin at the height of his splendor as Lord Chancellor, in 1620, and is his most memorable achievement in philosophy.  It contains a multitude of suggestive thoughts on the whole field of science, but is mainly the exposition of the fallacies by which the intellect is deceived and misled, and from which it must be purged in order to attain final truth, and of the new doctrine of “prerogative instances,” or crucial observations and experiments in the work of discovery.

In short, Bacon’s entire achievement in science is a plan for an impossible universe of knowledge.  As far as he attempted to advance particular sciences by applying his method to their detailed phenomena, he wrought with imperfect knowledge of what had been done, and with cumbrous and usually misdirected efforts to fill the gaps he recognized.  In a few instances, by what seems an almost superhuman instinct for truth, rather than the laborious process of investigation which he taught, he anticipated brilliant discoveries of later centuries.  For example, he clearly pointed out the necessity of regarding heat as a form of motion in the molecules of matter, and thus foreshadowed, without any conception of the means of proving it, that which, for investigators of the nineteenth century, has proved the most direct way to the secrets of nature.  But the testimony of the great teachers of science is unanimous, that Bacon was not a skilled observer