112 Allen and Clement — Bole of Water in Tremolite. 





Table V 



(continued). 







Charge, 



2 



grams 





Time of 



Tempera 





Total loss 



Loss per day 



heating 



ture 





in mg. 



m mg. 



4^ hours 



600 





6'5 



•7 



6 " 



a 





7*2 



•7 



" 



(( 





8'0 



•8 



6i " 



u 





9-0 



1-0 



°2 



u 





9'4 



•4 



6 " 



a 





9-9 



•5 



H " 



a 





10-5 



•6 



H " 



a 





10-9 



•4 



H " 



a 





11-3 



•4 



et « 



a 





12-0 



•7 



8 



6 ■ : 



4 = 



2 — — / 



IOO 200 300 4OO 5OO 



Curve showing loss of water from mesolite at different temperatures. 

 Plotted from Friedel's data. Bull. Soc. Min., xxii, pi. opposite p. 89, 1899. 



After about 60 hours' heating at 600°, the mineral had 



'012 

 therefore lost = 0'6 per cent of water and was still losing 



2-0 ' 



at about the same rate, viz., about -5 mg per day. An estima- 

 tion of the vapor pressure of the water over the mineral was 

 made by measuring the rate of flow of the air through the 

 furnace, taking into account the water which escaped during 

 the same time. During a day of six hours, this amounted to 

 1570 cc , while the average loss of water was about *5 mg , which, 

 under these conditions, would occupy a volume of approxi- 

 mately l cc . The partial pressure of the water vapor would 



