Viii TABLE OF CONTENTS. 



Barium, 20G; Precipitation of Metals by Zinc, 207 ; Specific Heat of Car- 

 bon, Boron, and Silicon, 213; a Hydrate of Carbon, 214; the Composition 

 of Bleaching-powder, 219$ Gallium, a Supposed New Chemical Element, 

 223 ; Purification <>f Tin by Filtration, 20G ; the Artificial Imitation of Na- 

 tive Magnetic Platinum, 206; Crystallized Cadmium, 205; the Combusti- 

 bility of Iron, 209 ; New Method of Assaying Iron, 209 ; Utilization of the 

 Pyrite Deposits of the Blue Ridge, 210 ; Hydrogenized Iron, 217 ; a Brittle 

 Alloy of Iron and Hydrogen, 218 ; to Detect Lead in the Tin Lining of 

 Vessels, 210; Precipitation of Metals by Zinc, 207; Copper in the Human 

 Body, 233 ; Absorption of Hydrogen by Metals, 208 ; the Physical Proper- 

 ties of Hydrogenium, 209 ; Peroxide of Hydrogen in the Atmosphere, 230 ; 

 Decolorizing Properties of Ozone, 215 ; New Facts concerning Ozone, 215. 

 Organic Compounds : Cryohydrates, 214 ; Carbonic Oxide in Tobacco 

 Smoke,216; Mellilotol, 21G; Manufacture of Artificial Vanilla, 217; Source 

 of the Acid of the Gastric Juice, 221 ; Decomposition of Chloral Hydrate 

 in the System, 222; Constitution of Ammonium and its Derivatives, 224; 

 Constitution of Gum Tragacanth, 225 ; Carbonyles, a New Class of Organic 

 Bodies, 22G ; Hsematin not Ferruginous, 227 ; on a New Coloring Matter 

 called Eosin, 229; Tartronic Acid a Glycerine Oxidation Product, 231; 

 Relative Amounts of Potash and Soda in Milk and Other Food, and in the 

 Entire Body, 233. 



E. MINERALOGY AND GEOLOGY (xcvi) 235 



(a.) MINERALOGY, (xcvi) 



Wapplerite, 244 ; Clarite, 244; Chalcophanite, 244; Melanosiderite, a New 

 Mineral, 248 ; Zonochlorite and Chlorastrolite, 244. 



(b.) GEOLOGY, (xcix) 



Pot-holes, or " Giant Kettles," 235 ; Champlain Deposits of Southern New 

 England, 246 ; Gas-wells of Pennsylvania, 247 ; Probable Age of the Crys- 

 talline Rocks of the Southern Appalachians, 236; Tin in NeAV South "Wales, 

 242 ; Discovery of a Bed of Nickel in Norway, 237 ; Magnetic Sand in 

 Labrador, 237; Interesting Phenomena Observed in Stone Quarries, 238; 

 Changes of Level on the Coast of Maine, 238 ; New Mining Region in New 

 Mexico and Arizona, 240 ; Geology of Costa Rica, 241 ; Falling of Atmos- 

 pheric Dust in Norway, March 29 and 30, 1875, 241 ; Gold in Eastern 

 Siberia, 243; Origin of the Red Chalk and the Red Clay, 243; the Massa- 

 chusetts Silver-lead Mines, 245; Petroleum Springs in North Germany, 

 240; Coal-mines in Russia, 240 ; Coal-field near Dranista, 241 ; Coal in the 

 Strait of Magellan, 142 ; Gas-wells of Pennsylvania, 247. 



F. GEOGRAPHY (cxiv) 249 



(a.) GEODESY, NAVIGATION, AND HYDROGRAPHY, (cxiv) 



On the Proper Arrangement of Geodetic Triangulations, 250; Geodesy in 

 Switzerland, 251 ; Trigonometrical Survey of India, 251 ; Progress of Baro- 

 metric Hypsometry, 254 ; the Trigonometrical Survey of India, 259; Geo- 

 detic Signals used in the Adirondack Survey. 260; Correction of Levels. 

 302; Hypsometry in California, 303 ; the Stadiometer, 304; the Harbor of 

 New York, 252 ; the Difference of Level between Raritan Bay and the 

 Delaware F.ivcr, 253; New Route between Australia and China, 254. 



