YOLOIETEIC EELATIONS OE OZONE. 
131 
application of the point of a fine blowpipe fiame, the current having been arrested, so 
as to leave the usual column of sulphuric acid in the siphon tube. In sealing it, care 
was taken not to allow the air in e to become heated. The vessel was again placed, 
along with the auxiliary, in the calorimeter, and the levels read. The ends of the siphon 
tubes ha\ing been first sealed, the reservoirs were exposed to 300° C. An expansion 
should have taken place in the primary vessel, if the platinum had retained oxygen 
capable of being disengaged at 300° C. ; but this was not found to be the case. The 
change of level in its sulphuric acid siphon (corrected by the auxiliary) did not amount 
to 0'2 millim., a degree of accuracy rarely attainable in these experiments. 
