~The c¥ Apres: 
common and other Sands : -a.defcri- 
ption of avery fmall Shell, 
81 Obferv. 12, Of Gravel in Urine. 
A defcription of fuch Gravel, and 
82 fometryals made with it, and conje- 
Fures at its caufe. 
Obfer. 13. Of Diamonds in Flints. 
A defeription and examination of 
fome of them, explicated further by 
83 Corkifh Diamonds : feveral obférva- 
tions about reflection and refraction : 
and fome deduttions therefrom ; as 
an explication of whitene(s; that the 
Air has a fironger refletion then Wa- 
84 ter. How feveral Bodies may be made 
tranjparent > an explication of the 
g5 Phenomena of Oculus Mundi. of 
thé regen ‘ar Geometri al. Figures of 
96 feveral Bodies : an hypotheticalexplh- 
| Gz cation mentioned: the method of pro- 
Seenting this inquiry. 
38 “Obfery 14: Of frozen Figure’. 
The Figures of hoar Froft, and the 
Bq Vortices on windows : feveral Objfer- 
vations on the branched Figures 
9 Urine: the Figures of Regulus Mar- 
; tisftellatus, avd of Fern. Of the Fi- 
g2 Sures of Snow. Of frozen water. 
: Obferv. 1 5. Of Kettering Stone. 
A defcription of the Figure of the 
94 Particles, and of the Pores, and of the 
gs Contexture. Several Obfervations and 
96 Confider ations therenpon : fome Con- 
” jecfures about. the medium and pro- 
97 pagation of light, and the conftitution 
“of fiuid and tranfparent Bodies. Se- 
98 weral Experiments to prove the po- 
——— toufnelS of ; Marble, and fome other 
Stones. An account of fome Experi- 
“ments to this purpofe made on an 
Oculus Mundi : fome other Confide- 99, 
rations and Experiments about the. — 
poroufnefof Bodies: fome other Con- yoo 
Jiderations about the propagation of. 
light and refration. 7 ee 
Obferv. 16. OF Charcoal. > 
Of two fort of Porestobe found yo, 
in all Woods and Vegetables; the — 
Shape of then, the number , thick- 
nef, manner and ufe of thefe Pores. - 
An explication of the Phenomena 102 
of Couls.. The manner of charring . 
Wood, or any other body. What part 
of Wood is combuftible, An Hy po- 463 
thefis of fire explicated in twelve 6 
particulars , wherein the Aion of - 
the tir, as a Menftruum, ix the dif- 
Solution of all fulphureous bodies, is 
very particularly explicated, and 105 
fome other Confiderations about the 
Air propofed: the examination of 
a piece of Lignum foflile feat from 106 
Rome, and foue Conclufions thence 
deduc'd. 
Obferv. 17.. Of Wood, and other 107 
Bodies, petrified. . 
Several Obfervations of divers 
kinds of thefefubfiances.A more par- 108 
ticular examination and explicati- 
on of one very notable piece of petri- 
fied Wood 3 and fome Conjettures.a~. 
bout the canfe of thofe productions... - 
Jeveral Obfervations made.on ether 109 
petrified Bodies, as Shells, &e..dad 15 
Some probable Conclufions thence de- 11 
duc'd, about the original canfe of 14> 
thofe Bodies. alitieh soe 
Obferv.18. Of the Pores of Cork, |, 3( 
-and other Bodies... 7 
erations about the nature of Cor. 
the number of Pores ina cubical 
Several Obfervations and cof 114 
