8 
DR. ANDREWS ON THE CONSTITUTION AND PROPERTIES OF OZONE. 
of potassa in the original solution, was neutralized by 30’23 measures of a solution of 
sulphurous acid, of which, as ascertained by direct experiment made at the time, 
1 measure neutralized 0 00521 grm. free iodine. Hence the oxygen due to the dis- 
placement of iodine was 
O'OlOO grm. 
III. 2'86 litres of the same gas as in the preceding experiments were passed 
through the apparatus. At first weighing, barometer 30’06 in., thermometer 6°'6 C. ; 
at second weighing, barometer 30'20 in., thermometer 6°‘l C. Gain of weight of D 
and E 0'0152 grm., corrected, 
0 0154 grm. 
The free iodine in D, corrected as before, was neutralized by 4T52 measures of a 
solution of sulphurous acid, of which 1 measure neutralized 0’00525 grm. iodine; 
hence the weight of oxygen, as deduced from the weight of iodine set free, was 
0'0138 grm. 
IV. 6‘45 litres of electrolytic oxygen were passed through the apparatus. At first 
weighing, barometer 29'96 in., thermometer 6°‘8 C. ; at second weighing, barometer 
29’29in., thermometer 7°'8 C. Gain of weight of D and E 0‘0303grm., corrected, 
0‘0288 grm. 
The free iodine in D was neutralized by 100’4 measures of a solution of sulphurous 
acid, of which 1 measure neutralized 0‘00441 grm. iodine ; hence the weight of oxygen 
deduced in this way was 
0‘0281 grm. 
V. 6'8 litres of electrolytic oxygen passed. At first weighing, barometer 30‘53in., 
thermometer 9°'8 C. ; at second weighing, barometer 30‘44in., thermometer 10°‘4 C. 
Gain of weight of D and E 0'0254, corrected, 
0'0251 grm. 
The free iodine in D neutralized 107*9 measures of a solution of sulphurous acid, of 
which I measure was equivalent to 0*00358 grm. iodine ; hence the weight of oxygen 
deduced from the iodine set free was 
0’0273 grm. 
Collecting these results and adding them together, so as to obtain the mean of the 
whole, we have 
Ozone deduced from the increase 
in weight of the apparatus. 
I. 0*0379 grm. 
II. 0 0107 grm. 
III. 0‘0154grm. 
IV. 0*0288 grm. 
V. 0*0251 grm. 
Ozone deduced from 
the iodine liberated. 
0*0386 grm. 
0*0100 grm. 
0*0138 grm. 
0*0281 grm. 
0*0273 grm. 
0*1 179 grm. 
0*1 178 grm. 
