110 Scientific Intelligence. 
garding the allotropism of elementary bodies ; and particularly the late 
‘researches of Draper on the allotropic condition of chlorine.* If oxy- 
gen, by the influence of the electric fluid assumes a state of exalted 
energy and chemical affinity, we are furnished with a key to the 
modus operandi of electricity, in causing many chemical combinations. 
But in a science which is based on experimental knowledge, we must 
carefully avoid deducing our conclusions from isolated experiments or 
theoretical generalizations, however elegant those deductions may.ap- 
pear; and in the case of ozone, very careful investigations, performed 
with the most rigid. exactness, are required before we can admit — a 
“—_ and interesting conclusion 
At present, then, we agree vith Prof. Schénbein, that the: ‘hon 
weight of evidence rests with the view that it is a deutoxide of hydro- 
gen, which, although differing from the deutoxide of Thenard, has yet 
‘many striking points of resemblance; both bleach powerfully, both 
transform many protoxides to peroxides, (as, for example, protoxides of 
ealcium and barium,) both transform sulphurous to sulphuric acids, and 
are decomposed by heat and many organic substances. 
With regard to the late results of Marignac and de Ja Rive, M. 
Schonbein remarks: 1.-Ozone has so strong an odor, that extremely 
small quantities are capable of affecting the olfactory nerves. 2. Quan- 
tities of ozone by far too minute to be ascertained by weights still per- 
ceptibly color the test paste. 
From this it follows that a ieee of aqueous vapor, too small to 
be sensible by our most delicate hygroscopic tests, may generate S® 
much ozone’as shall be sensible both to the smell and the iodine test. 
We have thus endeavored to give a brief abstract of the present 
state of our knowledge with regard to this subject, and would-refer the 
reader who wishes to examine ie Sy 909 more thoroughly, to the au- 
.thorities already quoted. ' T. 8. Hung» 
2. Quantitative determination of Seas in Urine; by W. Hentz, 
(Pogg. Annalen, No. ix, 1845, and Chem. Gazet., Jan. 1846.)—His 
method is based upon the fact that urine when mixed with sulphuric 
acid and heated, has all of its urea decomposed, with the formation of 
sulphate of ammonia. Take two or three drachms of urine, and heat 
it with about two drachms of sulphuric acid, until all evolution of car- 
bonic acid ceases, not allowing the temperature to exceed 190°. ‘The 
liquid is next filtered into a porcelain dish, and most of the water evap- 
orated ; then add twenty drops of muriatic acid, and a sufficient quan- 
‘tity of chloride of platinum and alcohol mixed with ether. Allow the 
mixture to stand for some feney oelbeese ee acenaeeiteS and from 
“named 
‘estimate the amount of 
ea: * See this Journal, voli. p. 346. 
- 
