94 NOTICES OF THE MEETINGS [June 13, 
chemical force must be inversely proportional to the velocity of these 
interchanges. A. W 
In the Library were exhibited: — 
Specimens of the right and left Tartaric Acid and their Salts, exhi- 
biting hemi-hedrism in their Crystalline Forms — with Models and 
Figures illustrating their characters; sent by M. Pasteur to 
illustrate the lecture given by Mr. Maskelyne on Friday, March 
28. [by Nevil Story Maskelyne, Esq., vide p. 45.] 
Specimens of Kreatine and Kreatinine [by Mr. Bullock}. 
Woorari or Ourari Poison, and arrows armed with it, used by the 
natives of Guayana to kill game, supposed to be prepared from 
Strychnos — Upas Antiar Poison from Java— Specimens of Glu- 
ten Bread, and Bread from Janipha Manchot, British Guiana [by 
the Pharmaceutical Society]. 
Pheasants [mounted by Messrs. Leadbeaters]. 
Four Photographic Views of Edinburgh from Negatives on Glass, by 
Messrs. Ross and Thompson, Edinburgh [by Messrs. Henneman 
and Malone]. 
A Series of 23 drawings made from Sketches taken on the spot, illus- 
trating the Life and Writings of Wordsworth [by Mr. T. L. 
Shuckard], 
The late Bishop of Chichester (in Machine Sculpture) [by Mr. B. 
Chiverton. ] 
Fac-Similes of Ancient Coins [by Mr. Barclay.] 
WEEKLY EVENING MEETING, 
Friday, June 13. 
Tue Duxre or NortTHUMBERLAND, President, in the Chair. 
Proressor Farapay, 
On Schénbein’s Ozone. 
Tue object of the speaker was to give a brief account of the present 
state of this subject; taking at the same time notice of the ancient 
facts which belong to it, and the high hopes of progress which it 
offers for the future, Ozone is produced when the electrical brush 
passes from a moist wooden point into the atmosphere, and indee 
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