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CONTENTS. 



I. — Application of Organic Acids to the Examination of Mine- 

 rals (Second Paper). By H. Caerington Bolton _ 1 



II. — The Place of Sadi Carnot in the History of Thermotics. By 



R. H. Thurston ■ 19 



III. — On the Production of Peroxide of Hydrogen, as well as of 

 Ozone, by the Action of Moist Phosphorus upon Air. By 

 Albert R. Leeds, (with Plate I) 22 



IV. — The Geology of Hudson County, New Jersey. By Israel 



C. Russell, (with Plate II) 27 



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