ARTICLE X. 



Engraving and Description of an Apparatus for the Decomposition 

 and Recomposition of Water, employed in the Laboratory of the 

 Medical Department of the University of Pennsylvania. By R, 

 Hare, M. D., Professor of Chemistry. Mead December 7, 1838. 



Having to illustrate the decomposition and recomposition of water 

 to a class of between three and four hundred pupils, I have found it 

 expedient to exhibit the process on an extensive scale. 



For many years I have employed a glass tube, of about an inch and 

 a half in bore, and about two feet in height. 



The tube (A), which I have used for three years past, has been fur- 

 nished with two tubulures (B, b), about three inches below the upper 

 extremity, where it converges to an apex, having an aperture not larger 

 than a goose quill. Upon this apex there is an iron cap, in which a 

 Yi. — 4 K 



