74 
VARIETIES. 
Poisons, or other noxious medicines, which in the Swedish Phar- 
macopoeia have this mark must not be sold without a sufficient 
prescription, which ought to be retained by the Chemist, and not 
repeated without a note from the Physician. 
Poisoning is, consequently, very rare in Sweden, and when 
practiced it is commonly by means of white arsenic, which has 
probably been obtained from a glass manufactory. 
Secret medicines are forbidden in Sweden, in spite of which 
charlatans try to sell secretly their all-relieving medicines, but 
they seem more and more to lose the confidence of the public, 
and their credit, too, sinks in the same proportion as the reputa- 
tion of the scientific Physician increases. 
i)arictU0. 
On Schonbein' s Ozone. By Professor Faraday.* — Professor Faraday 
commenced "by stating, that considerable mystery was attached to the sub- 
ject which he proposed to bring before the members on the present occa- 
sion, namely, Ozone. This name had been gived by Schonbein, of Basle, 
to a substance or condition of matter which manifested itself under very 
peculiar and widely different circumstances. Schonbein regarded it as an 
independent body, and a constituent of the atmosphere ; but in his (Pro- 
fessor Faraday's) opinion, it was nothing more than an allotropic condition 
of oxygen. It was never manifested except where oxygen was present, 
and where, at the same time, water ? in a liquid or vaporous condition, was 
found. No substance had ever been separated from the atmosphere where 
ozone existed ; but its presence was manifested, not merely by the strong 
smell peculiar to it, but by certain well marked chemical properties which 
the atmosphere containing it possessed. 
When electricity is produced from a powerful machine, and allowed to be 
discharged by a point, there is a feeling of a current or aura as of vapor 
escaping, and at the same time a remarkable odor. If, during the passage 
of the electricity, a piece of paper moistened with a solution of iodide of 
potassium and starch, be brought near, the discharge causes the produc- 
tion of blue iodide of farina. The blue color thus produced is the result of 
* Lecture in the Royal Institute, June 13th, 1851. 
