Gale's Apparatus for obtaining Potassium, 61
Operations of Gossamer Spiders, 112
Hazard's Geometrical Diagram, 315
Crystal of Specular Iron, by C. U. Shepard, 329
Davy's decomposition of Potash, 367
Profile of Mohawk and Hudson Railroad, 385
Volcanic Island thrown up in the Mediterranean, 1831, 402, 403
Vol. XXII.–Plates.
1. Geological Map of Massachusetts, by Edward Hitchcock, 1832, 1
2, 3. Anatomy of the American Wild Swan, (Cygnus americanus,) 83
4. Steam Pyrometer, by W. R. Johnson, 96
5. Map showing the extent of Primitive and of Secondary Formations in the Connecticut River Valley, with various sections, 205
6. Diagrams of Oval Arches, 303
Wood Cuts.
Wright's Geometrical Diagrams, 76, 78, 81, 82
Apparatus for Disinfecting by Heat, (Dr. Wm. Henry's,) 120
Apparatus for measuring Expansion and Contraction of Stone, 137
""showing Effect of Elasticity, 191
Brewster's Diagrams illustrating Polarization of Light by Reflection, 278, 284
De Witt's Conical Rain Gauge, 321
Thomson's Diagram relative to Railroads, 347
Electro-magnetic Apparatus, 410, 412, 415
Vol. XXIII.–Plates.
1. Geological Map of the Mining Districts in Georgia, and parts of North Carolina and Tennessee, by J. Peck, 1
2, 3. Organic Remains of the Ferruginous Sand Formation of the United States, 288
Wood Cuts.