$24 -Dr. Brewster on the laws of polarisation y &c. 
f~ Anhydrite 
j Cymophane 
Two J Prehnite 
Axes. j Peridot 
■ S til bite 
^ Tartrate of potash 
1 Right qua- 
! drangular 
prism with a 
J rectangular 
base. 
Two 
Axes. 
'"Sulphate of strontian 
Sulphate of barytes 
Mica 
Talc 
J Spodumene 
Sulphate of soda 
Carbonate of potash 
Tartrate of potash 
soda 
-Citric acid 
1 
Right qua- 
> drangular 
■ prism; base 
a rhomb. 
and 
J 
Two 
Axes. 
Two 
Axes. 
j* Sulphate of lime 
i Epidote 
l-Axinite 
Borax 
Right qua- 
- drangular 
prism ; 
' base an ob- 
- lique paral- 
lelogram. 
f Oblique qua- 
[ drangular 
<■ prism with a 
| rectangular 
L base. 
("Oxalic acid 
I Sugar 
Sulphur 
A vps ^ Acetate of copper 
j Tartaric acid 
(.Chromate of lead 
Two 
Axes. 
Feldspar 
Kyanite 
Sulphate of copper 
{ Calcareous spar 
Bitter spar 
Quartz 
Tourmaline 
j Oblique qua- 
y, drangular 
j prism ; base 
J a rhomb. 
f Oblique qua- 
1 drangular 
j prism ; base 
\ an oblique 
parallel- 
(_ ogram. 
J Rhomboid 
Mvith an ob- 
] tuse summit. 
Two 
Axes. 
j>Sulph 
ate of iron 
One 
Axis. 
f Arseniate of copper 
I Apatite 
Beryl 
^ Emerald 
I Nepheline 
j Sapphire 
(.Ruby 
Three f Garnet 
Axes. \ Blende 
One & 
Two 
Axes. 
Sulphate of potash 
Three 
Axes. 
r Fluor spar 
Muriate of ammonia 
Alum 
J Spinelle ruby 
Pleonaste 
Diamond 
Ruby copper 
-Nitrate of lead 
f Nitrate of potash 
j Sulphate of soda 
Two J Arragonite* 
Axes. ■ Topaz 
] Carbonate of leadf 
C Sulphate of lead 
One 
Axis. 
f Zircon 
| Mellite 
Idocrase 
j Apophyllite 
(. Arseniate of potash 
Two 
Axes. 
} 
Carbonate of soda 
{ Rhomboid 
with an acute 
summit. 
{ 
Regular hex- 
aedral prism. 
Rhomboidal 
dodecahe- 
dron. 
r Bipyrami- 
dal dode- 
„ cahedron. 
l Regular 
1 Octohedron 
! in which the 
y pyramids 
J have a rec- 
tangular base 
"] Octohedron 
I in which the 
pyramids 
J have a square 
base. 
f Octohedron 
| in which the 
J pyramids 
j have a rhomb 
for their 
h base. 
* Eournon makes it a quadrangular rectangular prism with a square base, 
t Bournon makes it a quadrangular prism with a rhomboidal base. 
