_An Introduction to this Tract. An Accompt of the Improvement of _Optick Glasses_ at _Rome_. Of the Observation made in _England_, of a Spot in one of the Belts of the Planet _Jupiter_. Of the motion of the late _Comet_ praedicted. The Heads of many New Observations and Experiments, in order to an Experimental _History of Cold_; together with some _Thermometrical_ Discourses and Experiments. A Relation of a very odd Monstrous _Calf_. Of a peculiar _Lead-Ore_ in _Germany_, very useful for Essays. Of an _Hungarian Bolus_, of the same effect with the _Bolus Armenus_. Of the New _American_ Whale-fishing about the _Bermudas_. A Narative concerning the success of the _Pendulum-watches_ at Sea for the _Longitudes_; and the Grant of a _Patent_ thereupon. A Catalogue of the Philosophical Books publisht by _Monsieur de Fermat_, Counsellour at _Tholouse_, lately dead._ * * * * * _The Introduction._ Whereas there is nothing more necessary for promoting the improvement of Philosophical Matters, than the communicating to such, as apply their Studies and Endeavours that way, such things as are discovered or put in practise by others, it is therefore thought fit to employ the _Press_, as the most proper way to gratifie those, whose engagement in such Studies, and delight in the advancement of Learning and profitable Discoveries, doth entitle them to the knowledge of what this Kingdom, or other parts of the World, do, from time to time, afford, as well {2} of the progress of the Studies, Labours, and attempts of the Curious and learned in things of this kind, as of their compleat Discoveries and performances: To the end, that such Productions being clearly and truly communicated, desires after solid and usefull knowledge may be further entertained, ingenious Endeavours and Undertakings cherished, and those, addicted to and conversant in such matters, may be invited and encouraged to search, try, and find out new things, impart their knowledge to one another, and contribute what they can to the Grand design of improving Natural knowledge, and perfecting all _Philosophical Arts_, and _Sciences_. All for the Glory of God, the Honour and Advantage of these Kingdoms, and the Universal Good of Mankind. * * * * * _An Accompt of the improvement of_ Optick Glasses. There came lately from _Paris_ a Relation, concerning the Improvement of _Optick Glasses_, not long since attempted at _Rome_ by Signor _Giuseppe Campani_, and by him discoursed of, in a Book, Entituled, _Ragguaglio di nuoue Osservationi_, lately printed in the said City, but not yet transmitted into these parts; wherein these following particulars, according to the Intelligence, which was sent hither, are contained.