This disguised freethinker, for he does not appear to me to be anything else, was one of the most original thinkers of the period intermediate between the Middle Ages and Descartes.

MICHAEL SERVETUS; VANINI.—Such instances of temerity were sometimes fatal to their authors. Michael Servetus, a very learned Spanish physician who perhaps discovered the circulation of the blood before Harvey, disbelieved in the Trinity and in the divinity of Jesus, and, as he was a Platonist, perceived no intermediaries between God and man save ideas. Persecuted by the Catholics, he sought refuge at Geneva, believing Calvin to be more merciful than the Inquisitors, and Calvin burned him alive.

Vanini, half a century later, that is at the commencement of the seventeenth, a restless, vain, and insolent man, after a life full of sudden changes of fortune, and yet distinguished, was burnt alive at Toulouse for certain passages in his De admirandis ... arcanis, and for having said that he would not express his opinion on the immortality of the soul until he was old, a Jew, and a German.

BRUNO; CAMPANELLA.—Giordano Bruno, an astronomer and one of the first to affirm that the sun was the centre of the world, professed, despite certain precautions, a doctrine which confused God with the world and denied or excluded creation. Giordano Bruno was arrested at Venice in 1593, kept seven years in prison, and finally burnt at Rome in 1600.

Campanella, likewise an Italian, who spent twenty-seven years in a dungeon for having conspired against the Spanish masters of his country, and who died in exile in Paris in 1639, was a sceptic in philosophy, or rather an anti-metaphysician, and, as would be said nowadays, a positivist. There are only two sources of knowledge, observation and reasoning. Observation makes us know things—is this true? May not the sensations of things which we have be a simple phantasmagoria? No; for we have an internal sense, a sense of our own, which cannot deceive us, which affirms our existence (here is the Cogito of Descartes anticipated) and which, at the same time, affirms that there are things which are not ourselves, so that coincidently the ego and the non-ego are established. Yes, but is this non-ego really what it seems? It is; granted; but what is it and can we know what it is? Not without doubt, and here scepticism is unshakable; but in that there is certitude of the existence of the non-ego, the presumption is that we can know it, partially, relatively, very relatively, while we remain infinitely distant from an absolute knowledge, which would be divine. Therefore let us observe and experiment; let us make the "history" of nature as historians make the history of the human race. And this is the simple and solid philosophy of experiment.

But Campanella, like so many more, was a metaphysician possessed by the devil of metaphysics, and after having imperiously recommended the writing of only the history of nature, he himself wrote its romance as well. Every being, he said (and the thought was a very fine one), exists on condition of being able to exist, and on condition that there be an idea of which it is the realization, and again on condition that nature is willing to create it. In other words, nature can, knows what she wishes, and wishes. Now all beings, in a greater or less degree according to their perfection or imperfection, feel this triple condition of being able, knowing, and wishing. Every being can, knows, and wishes, even inorganic matter (here already is the world as will and representation of Schopenhauer), and God is only absolute power, absolute knowledge, and absolute will. This is why all creative things gravitate to God and desire to return to Him as to their origin, and as the perfection of what they are: the universe has nostalgia for God.

Campanella was also, as we should say nowadays, a sociologist. He made his "Republic" as Plato had made his. The Republic of Campanella was called the City of the Sun. It was a community republic, leavened with aristocracy with "spiritual power" and "temporal power" somewhat after the manner of Auguste Comte. Campanella was a great sower of ideas.

FRANCIS BACON.—Francis Bacon, lawyer, member of Parliament, Lord Chancellor of England, personal friend of James I, friend, protector, and perhaps collaborator with Shakespeare, overthrown as the result of political animosity and relegated to private life, was a very learned man with a marvellous mind. Like his namesake, Roger Bacon, but in an age more favourable to intellectual reform, he attempted a sort of renewal of the human mind (Instauratio Magna) or at least a radical revolution in the methods and workings of the human mind. Although Francis Bacon professed admiration for many of the thinkers of antiquity, he urged that it was wrong to rely on them because they had not sufficiently observed; one must not, like the schoolmen, have ideas a priori, which are "idols," and there are idols of tribe, of party, of school, of eras; intentions must not be perceived everywhere in nature, and we must not, because the sun warms, believe it was created to warm, or because the earth yields nourishment believe her creation was for the purpose of feeding us, and that all things converge to man and are put at his service. It is necessary to proceed by observation, by experiment, and then by induction, but with prodigious mistrust of induction. Induction consists in drawing conclusions from the particular to the general, from a certain number of facts to a law. This is legitimate on condition that the conclusion is not drawn from a few facts to a law, which is precipitate induction, fruitful in errors; but from a very large number of facts to a law, which even then is considered as provisional. As for metaphysics, as for the investigation of universal law, that should be entirely separated from philosophy itself, from the "primary philosophy" which does not lead to it; it has its own field, which is that of faith: "Give to faith what belongeth to faith." In the main he is uninterested in metaphysics, believing them always to revolve in a circle and, I do not say, only believes in science and in method, but has hope only from knowledge and method, an enthusiast in this respect just as another might be about the super-sensible world or about ideas, saying human knowledge and human power are really coincident, and believing that knowledge will support humanity in all calamities, will prolong human life, will establish a new golden age, etc.

Moreover, let there be none of that eternal and unfounded fear that knowledge will cause the disappearance of the religious feeling. With profound conviction and judging by himself, Bacon said: "A little philosophy inclineth a man's mind to atheism, but depth in philosophy bringeth a man's mind about to religion." Such is true philosophy, "subordinate to the object," attentive to the object, listening to the voices of the world and only anxious to translate them into human language: "that is true philosophy which renders the voices of the world the most accurately possible, like an echo, which writes as if at the dictation of the world itself, adding nothing of its own, only repeating and resounding."

And, as a man is always of his time, he believed in alchemy and in the possibility of transmuting base metals into gold. But note how he understood it: "To create a new nature in a given body or to produce new natures and to introduce them ... he who is acquainted with the forms and modes of super-inducing yellowness, weight, ductility, fixity, fluidity, solution, and the rest, with their gradations and methods, will see and take care that these properties be united in some body, whence its transformation into gold may follow." Modern chemistry, with scientific methods highly analogous to those which Bacon indicated or foresaw, has not made gold, which is not a very useful thing to do, but has done better.