work: he wrote accordingly asking us to supply in his name what by chance it had been denied him to complete." The "unforeseen chance" may, as Sigwart suggests, have been the final putting into effect of the Council's refusal to allow him to stay in the town, which may till then have remained a dead letter; or it may have been the summons to Zurich. He had made the acquaintance of a young Swiss squire, Hainzel, an Augsburger by birth, at whose castle of Elgg in Switzerland a gay and open hospitality was extended to a number of the bizarre and the learned spirits of the time: Hainzel had leanings towards the Black Arts,--Alchemy and the rest,--but had interest to spare for any others about which an air of mystery clung, such as Bruno's _Art_ of Memory and of Knowledge. Bruno spent a few months with him near Zürich and wrote for him the _De imaginum compositione_, etc.--as a handbook of these arts. Another of the Frankfort pupils would also be in Zürich, the brilliant but erratic Raphael Eglin, who published in 1609 at Marburg (where he was professor of theology), a work Bruno had dictated in Zürich,--the _Summa Terminorum Metaphysicorum_. Eglin suffered along with his friend Hainzel from the trickery of the Alchemists, to whom recourse was had in the hope of repairing the fortunes dissipated by the Squire of Elgg's hospitality.[99] The _Summa_ is dedicated in a letter of April 1595 (from Zürich) to _Frederic a Salices_, and in a personal reminiscence Eglin remarks on Bruno's fluency of thought and speech--"standing on one foot, he would both think and dictate as fast as the pen could follow: so rapid was his mind, so forceful his spirit." [Sidenote: March, 1591.] In order perhaps to print the _De Imaginum Compositione_ for Hainzel, or to complete the other works, Bruno returned to Frankfort about the beginning of March, 1591, and on the 17th of that month obtained permission to publish the _De Minimo_.[100] It is to this period probably that he referred when he spoke of himself before the Venetian tribunal, as having spent six months in Frankfort (Doc. 9). It was a _second_ period of six months after his return from the Zürich visit, of which he omitted all mention--no doubt he had good reason for that.[101] At the autumn book-market his _De Monade_, _De Immenso_, and _De Imag. Compositione_, were ready[102]--the last works that he published. About the same time, on an evil day for himself, he responded to the invitation of a young Venetian patrician, and crossed over to his fatherland,--the last of his free journeyings. [Sidenote: _De Minimo._] [Sidenote: _De Monade._] [Sidenote: _De Immenso._]