The Frankfort works are fully dealt with in the chapters on Bruno's philosophy that follow: in their order they were (1) the _De triplici Minimo et Mensura_:--"On the threefold minimum and measurement, being the elements of three speculative and of many practical sciences":--dedicated to Duke Henry of Brunswick. It is the first of three Latin poems, written somewhat after the manner of Lucretius, but with prose notes to each chapter or section. The style unfortunately seldom approaches that of Lucretius, either in Latinity or in poetic imagery, but the works are full of vigorous verse, and the force of the ideas suffers little from the fact that they are pressed into the Procrustean bed of rhyme and rhythm. The others were (2) the _De Monade, Numero et Figura_:--"On the Monad, number and figure, being the elements of a more esoteric (_secret_, or perhaps _inward_) Physics, Mathematics, and Metaphysics"; and (3) the _De Immenso et Innumerabilibus_:--"On the Immeasurable and the Innumerable, or on the universe and the worlds." Both are dedicated to Duke Henry. The three works together contain Bruno's finished philosophy of God and of Nature, of the universe and of the worlds within it, as well as a criticism of the prevailing and contrary doctrines of the time. [Sidenote: _De Imag. Comp._] In Frankfort appeared also, in 1591, (4) the _De Imaginum, Signorum, et Idearum Compositione_:--"On the composition or arrangement, of Images, Signs, and Ideas, for all kinds of inventions, dispositions, and memory." It is dedicated to Hainzel, and is the last of the works published by Bruno himself. It sums up all those published earlier on the theory of knowledge and on the art of memory. It assumes an identity between the Mind from which the universe sprang, or which is expressed in the universe, and the mind of each individual by whom it is known or approached. It follows that the ideas in our own minds contain implicitly a knowledge of the inmost nature of reality. Here, however, it is chiefly the mnemonic corollaries of this thought that are developed--ideas are to be arranged or grouped about certain images or pictures, in such a way that when any one occurs to the mind, it may readily call up those others which are most closely associated with it, _i.e._ which belong to the same [Greek: topos] or "place" in the mind. XIV [Sidenote: Venice.] [Sidenote: Aug. 1591.]