332 REGISTER OF PLATES, MAPS AND OTHER ILLUSTRATIONS. 
oe 
3. 
4. 
1. 
2, 
5. 
6. 
Page. 
Plan of a Frame Bridge, by Lieut. G.W. Long, - 125 
Crystals of Franconia. Hpidotp: bent C. U. Shepard, - 130 
Crystals of Garnet, - 132 
Illustration of becamapasition of Wat ater by Gahan Currents, 200 
New Instrument for taking Specific Coates - 265 
Crystals of Tourmaline, by C. U. Shepard, *  - - 299,301 
Ideal Section of Strata at Wilkesbarre, in Pennsylvania, 309 
Cross Section of Gaylord’s mine, West side of the Susque- 
hannah River, - - 325 
View of a Contorted Coal Bed at Bison, Penni es - 326 
Vou. XIX.—PLatTEs. 
. Coal Mine at Mauch Chunk, - - 12 
. Map showing the position of Coal Beds now sane | in the 
Mauch Chunk Coal Region, - - - - 9 
View of the Chute at Mauch Chunk, - - 9 
Imaginary Cross Section of the Mountain at the Great Coal 
Mine, - - - =e 12 
Vertical Section of Coal Beds: - 12 
Chemical Laboratory and Lecture Room in the Medical De- 
partment of the University of Pennsylvania, - 26 
. Sections of the Hartz Mountains, - - - 105 
Ulmus racemosa, (Thomas,) a new species, - : 170 
Phalzena antiqua; imago, larve, &c., - - 62 
Illustrations of Arsenious acid and Arsenic acid, - 340 
Woop Cuts. 
Glass lenses, - - - - - 58 
Furnace for cementing Steel, - - - - 183 
s ‘* obtaining Potassium, - - - 212 
Apparatus for trying “Strength of Timber, - - 234 
Diagram illustrating Halley’s theory of Trade Winds, 270 
Ground plan of Mine of Spa pee in New Milford, Conn., 3138 
Section of do., - - - 317 
“mproved Surveyor’s Compas - 338 
Tusk of a Mastodon, found near Rothestes N. Vi, - 359 
Singular impression in Marble, - - - 361 
Henry’s large Electro-magnet, - - - 408 
Vout. XX.—PuatTEs. 
W. C. Redfield’s Chart of the Atlantic Ocean, with track of 
a storm of August, 1830, - - 17 
3,4. Aldini’s Apparatus for Protection pantaat Fire, - 96 
Transition Rocks of the Cataraqui, - - - 74 
~ Organic Remains, (trilobites,) &c., - - - 78 
Coal plant, (Crotalus? of A. Eaton,) - - 122 
Tullia pycnanthemoides, - . - - 343 
