222 Meissner’s Researches upon Electrized Oxygen. 
method of titration. If, however, the solution of potassium 
iodid be either very dilute or tas ‘concentrated, or particularly, 
if it be acidulated ; or, what is the same thing, i a solution of 
ydriodic acid be used, —in which case no iodic acid is formed 
—then the method of titration becomes accurate, the results 
agreeing with those obtained by weight. The objections how- 
ever to the acidulated potassium iodid solution are: Ist, there 
is a loss of iodine, carried off by the antozone; and 2d, the 
iodine see in thick masses of crystals which stop entirely 
the delivery tu en too, the ozone enters the absorbing 
solution very dense, as when a given portion of oxygen is 
electrized for a long time, and then passed at once into it, the 
differences between the results of weighing and hen, are 
very much increased; the results then varying from 
1:4, instead of 1: 15°8 
e experiments on the influence of electrical tension upon 
bserved contraction, the ratio of 1-984 to 1; essen- 
tially: of 2:1. That is to say, the portion of deonesed oxygen 
absorbed by potassium iodid, weighs twice as much as the 
volume of a one disappears during the electrization. 
Thi traordinary, that the experiment was care- 
fully repeated, the ‘potnivta iodid being completely oxydized ; 
the oxygen absorbed weighed 00182 grams, the contraction of 
volume 0°00938 grams, being virtually 2:1. Meissner is not 
rep to claim this numerical relation, however ; he si 
maintains that the electrized oxygen absorbed by the iad 
weighs more than the volume corresponding to the contraction 
observed. He then goes on to diseuss the methods by which 
Andrews and Tait, and von Babo and Claus, came to different 
ts; criticising in the former case, the apparatus used, me 
formula for calculation, and the method of determining t 
ozone by titration ; and in the latter, the use of a neutral a 
of peg iodid having a wrong concentration, and the velo- 
city of the stream of oxygen, both of which, as shown above, 
affect the agen — to aes s results, which were made with 
oe Oxy Meiss r merely remarks that if ri 
*with the use ms a acute! spleGon of iodid as # apap ent, 
