Rotten-Stone, 319 
ber, that many other principles enter into the 
composition of most limestones besides carbo- 
nate of lime; as alumine, silex, bitumen, and 
sometimes magnesia ;—and that Rotten-stone 
contains, besides alumine, silex, bitumen or 
carbon, and frequently iron and calcareous 
earth;—and that the comparative proportions 
of these component parts differ greatly in the 
different varieties both 
Rottenstone. 
of Limestone and 
Our analysis of Rotten-stone has afforded 
the following results. 
1 Very hard Rotten-stone, ap- || 
proaching Black Limestone in 
external appearance. 
Alumine ........- hesesene td 
Silexisiiieescse Sera eS 
Carbonate of Lime..... . 14 
Oxide of [ron .........0.. 2 
Inflammable matter and 
FOSS) 5c/seesses Shaeeea! it 
_- 
100 | 
3. Hard Rotten-stone, but less , 
indurated than specimen 2, 
colour nearly similar. 
Alumine ...... she pwacsnney Oe | 
Bile daedancbachdevedepeseeskyiic: | 
Carbonate of Lime...... 5. 
Oxide of Iron.......00--. O-| 
{inflammable matter and | 
SA GOW; aay csGewassel Ve | 
| 
100 | 
2, Another specimen of the hard 
variety, but of a light brown 
colour. 
Alumitietest.isccecsesecaas (GO 
eeGeresen 2 
Carbonate of Lime...... 10 
Oxide of Iron.........006 1 
Inflammable matter and 
Silexteceacssnsesess 
JOSS? escnctecocedacansiiam 
100 
4. Soft Rotten-stune, i.e. witha 
texture much more loose or ear- 
thy than in the other specimens. 
Alumine See 7g 
waccsnece,, © 
BLES ae te hlannes 
Carbonate of Lime...... 0 
Oxiderol Uran...deseoscan nD 
Inflammable matter and 
loss 
@ereereeresestseee g* 
100 
* It should be observed that the “ loss,” in these ana« 
