If Signior _Cassini_ hath observed it on those daies that I have, he will be glad to find the conformity of our Observations. I shall only add, that on _February_ 3. we were surprized, to see the Comet again much brighter than ordinary, and with a considerable Train. Some did believe, that it approach'd again to us. But having beheld it with a _Telescope_, I soon said, that it was joyned with two small Stars, whereof one was pretty bright, which I had already seen, on _February_ 28. and 29. And this conjunction gave the _Comet_ that brightness, as it happens to most of the Stars of the fifth and sixth magnitude, where 2. or 3. or more are conjoyned, which perhaps would shew but faintly single, though by reason of their proximity to one another, they appear but one Star. Hence it was, that I assured my friends here, that the following daies we should no more see it so bright, because I knew, that there were none such small bright Stars in the way, which by my former observations I conjectured it was to move. * * * * * _An Observation imparted to the Noble Mr. _Boyle_, by Mr. _David Thomas_, touching some particulars further considerable in the Monster mentioned in the first Papers of these _Philosophical Transactions_._ Upon the strictest inquiry, I find by one, that saw the Monstrous Calf and stone, within four hours after it was cut out of the Cows belly, that the Breast of the Calf was not stony (as I wrote) but that the skin of the Breast and between the Legs and of the Neck (which parts lay on the smaller end of the stone) was very much thicker, than on any other part, and that the Feet of the Calf were so parted as to be like the Claws of a Dog. The stone I have since seen; it is bigger at one end {21} than the other; of no plain _Superficies_, but full of little cavities. The stone, when broken, is full of small peble stones of an Ovall figure: its colour is gray like free-stone, but intermixt with veins of yellow and black. A part of it I have begg'd of Dr. _Haughten_ for you, which I have sent to _Oxford_, whither a more exact account will be conveyed by the same person. * * * * * _Extract of a Letter, lately written from _Venice_ by the Learned Doctor _Walter Pope_, to the Reverend Dean of _Rippon_, Doctor _John Wilkins_, concerning the Mines of Mercury in _Friuli_; and a way of producing _Wind_ by the fall of _Water_._