PLATES. 



I. Illustrative of Dr. M. Baumert's Paper on a new Oxide of Hydrogen, 



and its relation to Ozone. 



II. Illustrative of Dr. Herapath's Paper on the Discovery of Quinine and 



Quinidine. 



k III. Illustrative of Sir David Brewster's Paper on the Optical Phenomena 

 and Crystallization of Tourmaline, Titanium, and Quartz, within 

 Mica, Amethyst, and Topaz. 



IV. Illustrative of M. Viard's Paper on the Electro-chemical Deportment 

 of Oxygen. 



V. Illustrative of Dr. Barry's Papers on a Main Cause of Discordant 

 Views on the Structure of the Muscular Fibril ; and Further 

 Remarks on the Muscularity of Cilia. 



