PREFACE.

but he exclaims with admiration, calling him the MOST CELEBRATED AND UNIVERSAL BORELLI, and he proclaims himself HAPPY to have become a participant in the grace of the most celebrated BORELLI, etc. The Most Excellent and Renowned STURM not only extols the same Borelli with the highest honor in the Ephemerides of the Curious of Nature, but also modestly elucidates some of his more obscure Propositions, etc. Indeed, even the Author's antagonist, MR. STEFANO DEGLI ANGELI, exclaims "Most Illustrious and Excellent BORELLI"; and what more is it necessary for me to bring here, when the conclusion remains unshaken: BORELLI STRIKES THE STARS WITH HIS SUBLIME HEAD? I will add only one or two words regarding the occasion on which our Author wrote and published the aforementioned Responses: Mr. STEFANO DEGLI ANGELI was a most celebrated Professor of Mathematics at the Paduan Academy, who in the year 1667 brought to light First considerations on the force of some Physico-Mathematical reasons brought by the Very Reverend Father Gio: Battista Riccioli of the Society of Jesus, in his New Almagest, and Reformed Astronomy, against the Copernican system: Expressed in two Dialogues; then in the year 1668, Second considerations on the force of the Physico-Mathematical Argument of the Very Reverend Father Battista Riccioli of the Society of Jesus, against the diurnal Motion of the Earth, Explained by Signor Michiel Manfredi in his answers and Reflections on the first Considerations of F. Stefano degli Angeli, Venetian, Mathematician in the study of Padua, expressed by the latter in two other Dialogues, third and fourth, and also in the same year, Third considerations on a Letter of the Most Ill. and Exc. Signor Gio: Alfonso Borelli, of Messina, Mathematician in the study of Pisa, written by him in Reply to some Doctrines incidentally touched upon by Fra: Stefano de gli Angeli, etc.: expressed by the latter in a dialogue, fifth in Order; Finally, in the year 1669: Fourth considerations on the confirmation of an opinion of Signor Gio: Alfonzo Borelli of Messina, Mathematician in the study of Pisa. Produced by Diego Zerilli, against the third considerations of Stefano de gl' Angeli, etc.: and on the apology of the M. R. P. Gio: Battista Riccioli, in favor of his argument called Physico-Mathematical, against the Copernican System, in two Dialogues, the sixth and seventh. Therefore, since Mr. Stefano degli Angeli moved certain Mathematical controversies against Borelli's book On the Force of Percussion in these listed dialogues, our Author could not but oppose them with equivalent responses here, which he modestly added to his own book already named. Having thus inculcated these things for you in passing, Benevolent and Curious Reader, I pray that you fare well and hold me in favor.