13, How Ice and Snow may be made to last long; and what Liquor dissolves Ice sooner than others, and in what proportion of quickness the Solutions in the several Liquors are made, where occasion is offered to the Author, to examine, whether Motion will impart a heat to Ice? After which he relates an Experiment of _Heating_ a _Cold_ Liquor with Ice, made by himself in the presence of a great and Learned Nobleman, and his Lady, who found the Glass wherein the Liquor was, so hot that they could not endure to hold it in their Hands. Next it is examined, whether the effects of Cold do continually depend upon the actual presence and influence of the manifest Efficient causes, as the Light of the Air depends upon the Sun or Fire, or other Luminous Bodies. To this is annexed an Account of the _Italian_ way of making _Conservatories_ of Ice and Snow, as the Author had received it from that Ingenious and Polite Gentleman, Master _J. Evelyn_. {52} But want of time prohibiting the accomplishment of the intended account of this Rich Piece: what remains, must be referred to the next Occasion. It shall only be intimated for a Conclusion, that the _Author_ hath annexed to this _Treatise_, an Examen of Master _Hob_'s Doctrine touching _Cold_; wherein the _Grand_ Cause of _Cold_ and its Effects is assigned to _Wind_, in so much that 'tis affirmed, that almost any Ventilation and stirring of the Air doth refrigerate. * * * * * _LONDON,_ Printed with Licence, By _John Martyn_, and _James Allestry_, Printers to the _Royal-Society_, 1665 {53} * * * * * _Numb._ 4. PHILOSOPHICAL _TRANSACTIONS._ * * * * * _Munday_, _June_ 5. 1665. * * * * * The Contents. _A Relation of some extraordinary Tydes in the _West Isles_ of _Scotland_, by Sr. _Robert Moray_. The judgment of Monsieur _Auzout_, touching the _Apertures_ of _Object-glasses_, and their _proportions_ in respect of the several lengths of _Telescopes_; together with a _Table_ thereof. Considerations of the same Person upon Mr. _Hook's_ New Engine for grinding of _Optick-glasses_. Mr. _Hook's_ Thoughts thereupon. Of a means to illuminate an _Object_ in what proportion one pleaseth; and of the _distances_, that are requisite to burn Bodies by the _Sun_. A further accompt by Monsieur _Auzout_ of Signior _Campani_'s Book, and Performances about _Optick-Glasses_. _Campani_'s Answer thereunto; and Mr. _Auzout_'s Animadversions upon that Answer. An accompt of Mr. _Lower_'s newly published _Vindication_ of Dr. _Willis_'s Diatriba de _Febribus_._ * * * * * _A Relation of some extraordinary Tydes in the West-Isles of _Scotland_, as it was communicated by Sr. _Robert Moray_._