410 Scientific Intelligence. 
The acid may also be aor by adding very dilute sulphuric 
acid, (1 molecule in a liter) to the sodic salt. A beautiful deep 
phur, and loses its activity. The ict ot ei _— of the liquid 
after the action of the zinc, as measured ermanganate solu- 
tion, was found to be exactly icmalard greater than that of the 
hydro-so odic sulphite originally: 
(HNa S0,),+Zn=Na, 50,4 Zn50,+50H. cea 6. 
Taking the bleaching power of one molecule of SO, unity, 
and exclu ding the zine , the first member of the above pee 
contains three decolorizing units, the second (by i con- 
tains four, an increase of one-third, This accords with the pre- 
vio us statement in regard to the ate iehg as by the action of 
zinc upon ae ‘acid. The react 
© ,)2+Zn=Zn 50, -LSOHL HO+H, 8. 
In this case ial are two units of decolorizing power in the first 
i and three in the second, an increase of one-half as above 
stat 
Because of the composition and ne mode of formation of this 
acid, Schiitzenberger proposes to call it hydro-sulphurous acid, 
and its sodic salt, sodic PW a AY Hg He has act it by the 
action of i iron, Manganese, yand magnesium on hite soneaee 
an atm eehert cotta: cana ozone, aerie oe: paper une bees 
from the production of thallic oxyd. Pure oxygen, and air free from — 
ozone were 205 to be without action. Inasmugh as it was said to 
remain una ted i in presence - nitrous nn it mond be invalu- | 
com ve ‘cmanamcnte with two different inde of. the test paper, : 
ey | 
 Ssip 
exposing ee under the most diverse conditions. In Pa 
ere wei: in the Honievard St. gp Feta the endens of the — 
