6. What kind of Grass is fittest to be preserved for Winter feeding? And what Grass is best for Sheep, for Cows, Oxen, Horses, Goats, &c. * * * * * Advertisement. _The _Reader_ is hereby advertised, that by reason of the present Contagion in _London_, which may unhappily cause an interruption aswel of _Correspondencies_, as of _Publick Meetings_, the Printing of these _Philosophical Transactions_ may possibly for a while be intermitted; though endeavours shall be used to continue them, if it may be._ * * * * * _LONDON,_ Printed with Licence, by _John Martyn_, and _James Allestry_, Printers to the _Royal Society_, at the _Bell_ in St. _Pauls Church-Yard_. 1665. {95} * * * * * _Numb._ 6. PHILOSOPHICAL _TRANSACTIONS._ * * * * * Monday, _November_ 6. 1665. * * * * * The Contents. _An Account of a not ordinary _Burning Concave_, lately made at _Lyons_, and compared with several others made formerly. Of Monsieur _Hevelius_ his promise of communicating to the World his Invention of making _Optick Glasses_; and of the hopes, given by Monsieur _Christian Hugens_ of _Zulichem_, to perform something of the like nature; as also of the Expectations, conceived of some Persons in _England_, to improve _Telescopes_. An intimation of a way of making more lively Counterfeits of Nature in _Wax_, then are extant in _Painting_; and of a new kind of _Maps_ in a low _Relievo_, or _Sculpture_, both practised in _France_. Some _Anatomical_ Observations of Milk found in Veins instead of Blood; and of Grass found in the Wind-pipes of some Animals. Of a place in _England_, where, without Petrifying Water, Wood is turned into Stone. Of the nature of a certain Stone, found in the _Indies_ in the head of a _Serpent_. Of the way, used in the _Mogol's_ Dominions, to make _Salt-petre_. An Account of _Hevelius_ his _Prodromus Cometicus_, and of some Animadversions made upon it by a _French_ Philosopher; as also of the Jesuit _Kircher_'s _Mundus Subterraneus_._ * * * * * _An Account of a not ordinary _Burning Concave_, lately made at _Lyons_, and compared with several others made formerly._