I must not forget to acquaint you, that the same Day, a Messenger came to me with an Express from _Cæsar_, my Master. There happened an Earthquake at _Adrianople_, from which he took an occasion to tell me, that he perceived the same (so he judged it) at _Nissa_, _S. Sophia_ and other Places through which he Travelled, so that the Air, included in the Bowels of the Earth, did seem to have kept Pace with him, by some subterraneous Passages or Caverns, and to have travelled as far in a Day under Ground, as he himself had done on the Surface of it. This Conjecture afterward seemed to be confirmed, upon the Relation we received of an Earthquake that happened in _Constantinople_ four Days after, which seemed to be the same imprisoned Air, that had made its Way, under Ground, even to that City also. I leave the Matter to your Judgment; but this is certain, that Earthquakes are very frequent at _Constantinople_; for once, when I was there, about Mid-Night, my Lodgings did so shake, that it was almost ready to fall. This Accident awakened me, though fast asleep, and, having a Watch-Light burning by me all Night, when I saw here a Cup, there a Book, a Table, Board and Stone all tumbled in a Heap together, I was at first astonished at the Novelty of the Spectacle, till I had recollected myself; and judging it to be the Effects of an Earthquake, I then retired to that part of the House which I thought most secure from falling. The same Commotion of the Earth continued some Days, but not with like Violence. Yea, over all that great City, and especially in my Lodgings, and in the Temple of S. _Sophia_, you might see the Walls, though very thick, to crack and gape by reason of the Clefts made by such Earthquakes.