XI 



Page 

 Costa Rica, sounds on beach of 76 

 Cretaceous period, temperate 



climate 94-95 



teliosts, activity of 54 



Crocidolite of South Africa . . 104 



Crystals of calcite 19, 20 



diamond 21, 72. 105, 107 



quartz resembling dia- 

 monds 72 



ruby 21 



Cuba, W, I., cultivation of 



sugar-cane 1 5-16 



Cultivation of sorghum 5-6 



of sugar-beet 5-6 



of sugar-cane in Cuba. . 15-16 

 Cyclones in the West 3-5 



Dakota, minerals from 17 



Darkening of atmosphere by 



smoke 60-61 



Deceased members. .2, 33, 37, 56, 



66, 80 



Delaware Valley, gravels 7-12 



Descloizite 100 



Destruction of Adirondack 



forests 35-37 



Devonian placoderms, armor. 54 



Deweylite 17 



Diamond, crystals of. .21, 72, 105, 



107 

 Dimorphous foliage of Sphe- 



nophyllum 46 



Discovery of stone implements 



at Trenton i , 7-12 



in prehistoric mounds of 



Ohio 97 



Dolomyteof New York Island 



48-49 

 Drilling of rocks by the an- 

 cients 105 



Durability of marble 100 



Dust columns at Sombrero 



Island 3 



Earth's axis, change in posi- 

 tion of 89-90, 95 



Egypt, topography of 78-79 



Eigg, Hebrides, " singing 



beach "at 73 



Election of fellows 80 



of members..!, 18,31, 32, 37, 



48, 55, 71-72, 80, 100, 106 



of officers 1^-1 1 



Pack 



Elevation of Champlain de- 

 posits 95 



Emeralds 105 



of North Carolina 38 



Enclosure of spinel in ruby . . 21 



Eocene limestone, near Green 



River 13 



Erosion, glacial, in North 



America 5 1-52 



Eskimo Period 10 



Exhaustion of soil in America 



and Cuba 16-17 



Fellows, election of 80 



Field-work in local mineralogy 48 

 Fishes, ancient, armor of . . . . 54 



fossil, of Chemung group. 32 



fossil, near Green River. 13 



fossil, from Wyoming. .34, 38 

 Flint implements at Amiens. 80 

 Florissant, Col., fossil insects 13 



fossil palm 77 



Fluid cavities in minerals 13,81,107 

 Fluorite, phosphorescence of. 77, 



100 

 Foliage of Sphenophyllum, di- 

 morphous 46 



Forest growths, succession of. 36 



petrified, in Colorado . . . 6-7 

 Forests, destruction and pres- 

 ervation 35-37 



smoke produced by fires 



of 60-61 



Fossil fishes, ancient armor of 54 



from Chemung of Penn- 

 sylvania 32 



near Green River 13 



from Wyoming 34, 38 



Fossil insects at Florissant . . 13 

 Fossil palm at Florissant. ... 77 



near Green River 13 



Fossil plants at Golden 77 



Fossils of Loess formation. . . 14 

 Fourth Monobromphenole. . . 32 



Galenite 2, 23 



Garnet i , 18 



Gasteropods, from streets of 



Hartford 20 



Gems from Ceylon 17, 107 



Geological climate, alterna- 

 tions of 94-96 



in high latitudes 84-97 



