No. 1.] WRIGHT — GASES IN SMOKY QUARTZ. 19 



centimeter at 1*62 millimeters as found above, this multiplied by 

 1694-3 irives 2*74 cubic centimeters for the volume of the water 

 vapor at 100°. If we take the gaseous volume for one cubic 

 centimeter of the quartz at 0*97 cubic centimeter, the result 

 derived from No. 2 above, where the water determination was 

 most satisfactory, the temperature of the room at the time of 

 measurement being about 20*^ C, we have for the volume at lOO'^ 

 neo-lectino- the correction for the barometric pressure which was 

 not greatly different from 760 mm., 1-23 cubic centimeters. 

 Reduced to parts in 100 these volumes give 



100-00 



Por the reasons mentioned above this must be regarded, so far 

 as the water is concerned, as merely an approximate result. 



For the gases alone, leaving out of view the bituminous mat- 

 ter, which is not known to be specially connected with the cavities 

 in the material, and probably is not, we have the following 



.summary : 



CO2 93-33 



K 1-G7 



H 2 S trace 



SO 2 '' 



Y " 



CI? '' 



100.00 



The ammonia, if derived from the gas cavities, undoubtedly 

 existed there in combination with the carbon dioxide, as am- 

 monium carbonate. From the considerations mentioned above 

 the fluorine and chlorine detected by the tests applied also repre- 

 sent compounds of these elements with some of the other sub- 

 stances present. The results of the investigation show that the 

 contents of the cavities are chiefly water and carbon dioxide, 

 with a small portion of nitrogen, thus essentially confirming the 

 conclusions derived from microscopical examination. 



