But the attraction of these Electricks we observe to be very different. Resinous or unctuous bodies, and such as will flame, attract most vigorously, and most thereof without frication; as _Anime_, _Benjamin_, and most powerfully good hard Wax, which will convert the Needle almost as actively as the Loadstone. And we believe that all or most of this substance if reduced to hardness, tralucency or clearness, would have some attractive quality. But juices concrete, or Gums easily dissolving in water, draw not at all: as _Aloe_, _Opium_, _Sanguis Draconis_, _Lacca_, _Calbanum_, _Sagapenum_. Many stones also both precious and vulgar, although terse and smooth, have not this power attractive: as _Emeralds_, _Pearl_, _Jaspis_, _Corneleans_, _Agathe_, _Heliotropes_, _Marble_, _Alablaster_, _Touchstone_, _Flint_, and _Bezoar_. Glass attracts but weakly, though clear; some slick stones and thick Glasses indifferently: _Arsenic_ but weakly, so likewise Glass of _Antimony_, but _Crocus Metallorum_ not at all. Salts generally but weakly, as _Sal Gemma_, _Allum_, and also _Talke_; nor very discoverably by any frication, but if gently warmed at the fire, and wiped with a dry cloth, they will better discover their Electricities. No Metal attracts, nor Animal concretion we know, although polite and smooth; as we have made trial in _Elks_ Hoofs, Hawks-Talons, the Sword of a _Sword-fish_, _Tortois-shells_, _Sea-horse_, and _Elephants_ Teeth, in Bones, in _Harts-horn_, and what is usually conceived _Unicorns-horn_. No Wood though never so hard and polished, although out of some thereof Electrick bodies proceed; as _Ebony_, _Box_, _Lignum vitæ_, _Cedar_, _etc._ And although _Jet_ and _Amber_ be reckoned among _Bitumens_, yet neither do we find _Asphaltus_, that is, _Bitumens_ of _Judea_, nor _Sea-cole_, nor _Camphire_, nor _Mummia_ to attract, although we have tried in large and polished pieces. Now this attraction have we tried in straws and paleous bodies, in Needles of Iron, equilibrated, Powders of Wood and Iron, in Gold and Silver foliate. And not only in solid but fluent and liquid bodies, as oyls made both by expression and distillation; in Water, in spirits of Wine, _Vitriol_ and _Aquafortis_.