Part IV*. And Statural Pbilofbpby. 
correfpond with all thofe experiments $ and will be too long 
to fuit with this Catalogue. 
I fhall here only fay, I am inclined to believe, That, in 
this Cafe, all the three Bodies above mention d ferve toge- 
ther to compofe an Apt Recipient of that which is the 
true Luminous Body. That, as in the mixture of Sulphur 
and Water-, fulphurious Salts, of affinity with both, are 
ufed as a medium : fo here, the Cretaceous Parts ferve to 
fix the Nitrous $ and the Nitrous, to fix the Igneous 5 being 
of a middle nature and readily incorporated with them 
both. And being in this union expofed to the Sun Beams, 
or other Light, the Igneous parts ferve,for fome time, to re- 
tain a certain portion of fuch as are Luminous, or to give, 
as I may fay, a degree of Fixation to Thefe alfo : and that 
therefore this Mixture is kindled or made to fhine,by puting' 
it into the Light,as a fhck is made to burn, by puting it into 
the fire. 
Of fhining Flefh, fee a Relation of fome Remarkable 
Circumftances, made by Dr. J. Beal, and publilhcd 111 the 
Phil. Tra?if. (a) 00 N. 125; 
Of Inflruments relating to 3\£atural Pbilofopby. 
AN AIRE-FUMP; or an Engine to exhauft the Air out 
of any VefTel fitly appliedContrived and defenbed '(b) 0>) Experi- 
by the Honourable Rob. Boyle Efq 5 . Who hath alfo made 
therewith, and publifhed in feveral Tracls, a great variety n«k of the 
of accurate and inftruclive Experiments. ^ h p e r1 ^ of 
A Great CONDENSING ENGINE of Brafs 5 con- 
trived to ram and crowd a great quantity of Air into a 
little room. Whereto is alfo fitted an Iron Gun or 
Barrel. 
A Little CONDENSING ENGINE of Glafs , with a 
Brafs-Neck, Rammer and Valve fitted to it. . 
A WEATHER CLOCK. Begun by Sir Chr. Wren, (c) 0) &e urn. 
now Prefident of the Royal Society. To which other f oc ^ Royal 
Motions have fince been added , by Mr. Robert Hoofa. 312, 
Profeifor of Geometry in Grefham-CoUecfge. Who purpofes 
to publilh 4 Defcription hereof. I fhall therefore only take 
notice, 
