Towards the end of the year 1583 the King became enthralled by religious enthusiasm, and nothing was talked of in Paris but the conversion of King Henry. This fact changed the aspect of affairs as far as Bruno was concerned; he judged it prudent to leave Paris, and he travelled to England. The principal works published by Bruno during his stay in Paris are "Il Candelajo" and "Umbrae Idearum." The former, says Levi, is a work of criticism and of demolition; in this comedy he sets in groups the principal types of hypocrisy, stupidity, and rascality, and exhibiting them in their true colours, he lashes them with ridicule. In the "Umbrae Idearum" he initiates the work of reconstruction, giving colour to his thought and sketching his idea. The philosophy of Bruno is based upon that of Pythagoras, whose system penetrates the social and intellectual history of Italy, both ancient and modern. The method of Pythagoras is not confined, as most philosophies are, to pure metaphysical speculations, but connects these with scientific observations and social practice. Bruno having resuscitated these doctrines, stamps them with a wider scope, giving them a more positive direction; and he may with propriety be called the second Pythagoras. The primal idea of Pythagoras, which Bruno worked out to a more distinct development is this: numbers are the beginning of things; in other words numbers are the cause of the existence of material things; they are not final, but are always changing position and attributes; they are variable and relative. Beyond and above this mutability there must be the Immutable, the All, the One. The Infinite must be one, as one is the absolute number; in the original One is contained all the numbers; in the One is contained all the elements of the Universe. This abstract doctrine required to be elucidated and fixed. From a hypothesis to concentrate and reduce it to a reality was the great work of Bruno. One is the perfect number; it is the primitive monad. As from the One proceeds the infinite series of numbers which again withdraw and are resolved into the One; so from Substance, which is one, proceed the myriads of worlds; from the worlds proceed myriads of living creatures; and from the union of one with the diverse is generated the Universe. Hence the progression from ascent to descent, from spirit to that which we call matter; from the cause to the origin, and the process of metaphysics, which, from the finite world of sense rises to the intelligent, passing through the intermediate numbers of infinite substance to active being and cosmic reason.