"48154 ‘the Gases by different Bodies. 951 
Ligniform Asbestus. Rock Cork, 
Volumes, Volumes. 
IRGEON cas serersisirsimeins: «ONES C028 Siw eleas Oe 
Oxy-carbureted hydrogen O°41 .......... 0°68 
BT yATOgE | oiececcie onnettese . ODL os Hoge Tee OES 
It is worthy of attention that rock cork, though much. more 
spongy, shows a smaller difference in the proportion of the different 
gases absorbed. Amianthus squeezed forcibly together exhibited‘no 
sensible difference in its absorption. 
Exper. 4, with Saxon Hydrophane,* and Quartz from Vauvert.t+ 
—The Saxon hydrophane was dried in the open air, the quartz 
from Vauvert by exposure to a red heat. A volume of each of them 
freed from air by the air-pump absorbed the following proportions 
of gases :— 
‘ 
Hydrophane. Quartz. 
Volumes, Volumes, 
Ammoniacal gas ........ 64 oath, 418 
Muriaticacid .......... 17 HOTT 
PRPRUTOUS EU fei coats nef Of. sik sles oe 
Carbonic acid 3...cackeee .) slaseisse Se ae 
PM OMAME bait rss oe cub baa POE Liaw as a eck TT 
PEO Cee» 6 oi 6.0) 5,4 )38 <0 bin soe OOS )),j0.ny9 aracaien. SAE 
Cyr nha n FP Ss me: ba et OC! « etwa sel on AD 
REGIE, (hie Su <a ad oe, ere ly SYS ee main aac ee, 
The swimming quartz from St. Ouen, of the’ specific gravity 
0°468, gave, when treated in the same way, no perceptible differ- 
ence in its absorptions. 
Exper. 5, with Sulphate of Lime.—It was in the state of cal- 
cined gypsum, hardened by water, and dried in the open air. Its 
‘Specific gravity was 0°96. One volume of it freed from air absorbed 
the following quantities of gases :— 
Volume. 
TMEVOCINDEN CTW ech: cele ds vecstedcty U8 
AZOUCH IW iced ec ccseecesee ODS 
FAVOTOMOB ME sd. ca vse cen css OO 
Carbonic acid .........00.ecce se sees 0°43 
Exper. 6, with swimming Carbonate of Lime, or Agaric Mine- 
* According to Klaproth, Saxon hydrophane is composed of 
Billed, scvtectah tes fee tstdee tae hase, 938 
Alumina ...... E des uc Neb mecdpiaiie'e canst 16 
WVler bin AN Ei sg caiwartos kore 5:25 
The specific gravity of my specimen was IT, and its volume 0-2 cubic inch French. 
« Hence the observations could not be very precise, The stone splits in a ved heat ; 
‘therefore it was not put into the fire, 
+ This quartz is found in rolled flints at Vauvert, near Nimes, and appears 
to be pure quartz coloured red by oxide of iron, It is at times so light as to swim 
in water. The specific gravity of my specimen was 118, 100 parts of it Jost in 
the fire 3°35 parts, 
