Galileo was unceasingly active in his seclusion at Arcetri. In the year 1636 he completed his famous “Dialoghi delle Nuove Scienze.”[513] He also exerted himself, like a loving father who wishes to see his children provided for before he dies, about the preservation and republication of his works which were quite out of print. But all these efforts were frustrated by envy, ecclesiastical intolerance, and the unfavourable times. His cherished scheme of bringing out an edition of his collected works could neither be carried out by the French mathematician, Carcavy, who had warmly taken up the subject,[514] nor by the Elzevirs through the mediation of Micanzio.[515] He had also to give up his project of dedicating his “Dialoghi delle Nuove Scienze” to the German Emperor, Ferdinand II., and of publishing them at Vienna, as he learnt from his friend and former pupil there, Giovanni Pieroni, that his implacable foes, the Jesuits, were all-powerful; that Ferdinand himself was entirely under their influence; and moreover that his bitterest foe, Father Scheiner, was just then at Vienna.[516] In the following year, however (1637), Pieroni succeeded by his prudent and untiring efforts, during the temporary absence of Scheiner, in obtaining a licence for Galileo’s latest work,[517] and afterwards one at Olmütz also; but meanwhile he had sent the MS. by Micanzio[518] to be printed by the Elzevirs at Leyden, and, under the circumstances described by Pieroni, he did not prefer to bring out his book at a place where his bitterest enemies were in power.