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REGISTER OF PLATES, MAPS AND OTHER ILLUSTRATIONS. 333 
Woop Courts. ‘ 
age. 
Sketch of the Aurora Borealis, Mar 9,1831, - - 263 
Lenses for Microscopes, - - - 265,266, 267 
Wilder’s Geometrical Diagram, - - - 285 
Safety Apparatus for Steamboilers, - - 321 
Henry’s Apparatus for Reciprocating Motion by Magnetic 
Attraction and Repulsion,  - . - 342 
Apparatus for manufacturing smoking Sulphune Acid, 349 
Apparatus for filling barometer tubes in vacuo, - 365 
Vou. XXI.—Puatss. 
. Curves of Vaporization, - - - - 71 
. Prof. Joslin’s Electro-magnet, - 87 
. Section of Strata through a part of Gamectiont from milling 
to Haddam, on Connecticut River, by Ww. W. Mather, 94 
. Portrait of Eli Pec - - - 201 
= Rombrota.)s. - - - 264 
. Rotascope by Walter R. sobnsout - - 265 
Diagrams to E. F. Johnson’s paper on the pie yeloid: 280 
- Geological and Mineralogical Map of a part of Orange Co., 
New York, by Drs. Young and Heron, 1831, - 321 
Woop Cuts. 
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 Balrend: - - 385 
Volcanic Island thrown up in the Mediterranean, 1831, 402,403 
Vou. XXII.—Puates. 
. Geological Map of Massachusetts, by Edward Hitchcock, 1832, 1 
,o2- Anatomy of the American Wild Pyen (Cyguus ameri- 
canus,) - 83 
. Steam Begmeted by W. R. Naurcon! - : 96 
. Map showing the extent of Primitive and of Secondary 
Formations in the Connecticut River Valley, with various 
sections, - : - - - - 205 
. Diagrams of Oval Arches, - - - - 303 
Woop Corts. 
Wright’s Geometrical Diagrams, - 76, 78, 81, 82 
Apparatus for Disinfecting by Heat, (Dr. Win. Henry’s,) 120 
42 
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