LIST OF PLATES, VOL. II. 



Pl.ATK. 1. 



Apparatus to show the presence, and comparative aniouuts, of Ozone and 

 Hydrogen Peroxide in air tliat has been passed over moist phosphorus. 

 Art. Ill, pp. 22—27. 



Plate II. 



Generalized section of the roclis of Hudson County, New Jersey. Art. 

 IV, pp. 27—72. 



Plate III. 



The figures on Plates III to XIII inclusive, relate to Art. V, pp. 81 — 113. 

 Fig. 1. Ore-sampler at TV yandotte Works. 

 2. Slag-buggy at Cheltenham Works. 



Plate IV. 



Fig. 3. Blast-furnace at the Pennsylvania Lead Company's 

 Works, Mansfield Valley, Penn. 



Plate V. 



Fig. 4. Desilverization-kettles at the Germania Works, Utah. 



