XiV 



Page 



New York Island, mineralogy. .22, 



48-50 



North America, alternations 



of temperature 96 



exhaustion of soil 16-17 



glacial epoch in 102 



glacial erosion in 5 1-52 



singing beaches of 72-76 



skillof prehistoric races of 15 



North Carolina, minerals. . . 12-13, 



37-3S, 50, 53 

 Norwegian glaciers, amount of 



erosion by 52 



Oak-leaves of Alaska, large. . 95 

 Obsidian arrow-heads in Ore- 

 gon .• 82 



in volcanic ash 64 



Oberstein, Germany, lapidary 



work at 62 



Office of parenchyma of leaf.39-40, 



44-46 



Officers, election of 70-71 



Ontonagon, Mich., glacial 



phenomena at 14 



Onyx 62 



Oregon, Indian arrow-heads of 



obsidian 63, 82 



snow-peaks of 77 



Ores, Lake Superior 1,2 



silver, processes for amal- 

 gamation 1,2 



New Jersey, Triassic . . . 18-19 



Origin of leaf- forms 38-44 



of Puget Sound 104 



of sounds in nature 75 



Orthoclase 49 



Ozone, literature of 34 



Palaeolithic arrow-heads , . . .81-82 

 stone implements . . . . i, 7-12, 



81-82 

 Palisade Range, N. J., miner- 

 als 50 



Palm, fossil, at Florissant. ... 77 



near Green River 13 



Parenchyma of leaf, office of. 



39-40, 44-46 

 Patio and Cazo processes for 

 amalgamation of silver 



ores 1,2 



Patrons of the Academy, list. 113 



Page 



Perofskite 17 



Peroxide of hydrogen, litera- 

 ture of 34 



Peru, silver castings from... 15, 



62-63 

 Petrified forest in Colorado.. 6-7 



Phlogopite 49 



Phosphorescence of fluorite.77, 100 

 Phosphoric acid, exhaustion 



in soil 16 



Photomicrography, processes 



and results 105 



of wood-sections 107 



Pickling of ancient silver cast- 

 ings 15 



Piercing of granyte by use of 



corundum 105 



Pittsburg, Penn., acidity of 



atmosphere 65-66 



Pittsford, Vt., marble 101-102 



Placoderms of the Devonian. 54 



Planting of trees 35 



Plants, annual growth-rings in 88 



fossil, in Colorado 13? 77 



of northern Tertiary, 



present range 96 



Plattsburg, N. Y., "singing 



beach "at 73 



Porcupine mountains, Mich., 



geological structure... 14 

 Prehistoric races of America, 



skill of 15 



Processes for amalgamation of 



silver ores 1,2 



Process of cutting intaglios 



and cameos 105 



Pseudomorphs after garnet . . i 

 Publication Committee, Re- 

 port 12, 70 



fund, list of contributors. 112 

 Publications of Academy, list 



of recipients 138-149 



Puget Sound, origin of 104 



Pulmonate molluscs, lingual 



dentition 71 



Pyrite 21, 23 



Pyroxene 18 



Quartz 12, 18, 23, 49, 72 



Rapid City, Dak., arago- 



nite 17 



