Pilla left his heart at Naples. That city contained all the objects of his affections--a father, who had guided his first attempts in the field of science, and his family--a classical soil which had revealed to him the secret of its revolutions, a majestic landscape, which he could not find among the monotonous plains of Pisa, and above all _his own_ Vesuvius. It was in this way that he recalled to his mind the mountain which had been the subject of his daily study, and from whose summit nature presented herself to his eyes in the most striking contrasts, revealing to his view its subterranean convulsions, connected with the delightful picture of the Gulf of Baia. All his thoughts brought him back to Naples. When, from the height of the terraces of Campiglia our view extended from the peaks of Mount Amiata to the banks of the Popolonia, and from the Tuscan Archipelago to the distant horizons of Corsica and Sardinia, my poor friend often interrupted our reveries by saying,--"It is almost as beautiful as Naples, but my Vesuvius is wanting;" and then adding, "How unfortunate it is that Werner did not lay the foundation of geology at Naples; _he would have made it Plutonian_." Thus the love of his country, and the recollection of its wonders, were confounded in his mind with the cultivation of the science, and gave to his animated and poetical conversation a touching melancholy which agreeably tempered his vivacity. During the years of his professorship at Pisa, Pilla published, in succession, a comparative Essay on the formations which compose the soil of Italy;[38] a Collection of the Mineral riches of Tuscany;[39] two Memoirs on the Etrurian Formation;[40] History of an Earthquake felt in Tuscany, in 1846;[41] many notices respecting the Calcare-rosso, and on the temperature observed in the wells of Monte-Massi;[42] lastly, the first volume of his Treatise on Geology.[43] The entire work would have formed four octavo volumes. The materials were prepared, but death left the work incomplete. As these various writings are in the hands of all geologists, we give no analysis of them; which indeed would only be a faint reflection from the pictures present to your memory. I may merely say, that the elevated considerations of the general physics of the globe to which he has risen in appreciating and investigating the causes of earthquakes, the comprehensive and methodical plan on which he has projected this geological treatise, by affording us a proof of the fertility and maturity of his mind, shew us, at the same time, the importance of the part reserved for a philosopher, whom death has removed from the present scene before he had reached his thirty-sixth year. Footnote 38: Saggio comparative dei terreni che compongono il suolo de l'Italia, Pisa. Footnote 39: Breve cenno sopra la richezza mineralogica della Toscano, Pisa.