Page 



Beryl 2, 38, 107 



Biotite 49 



Blocks of conglomerate, sepa- 

 ration of 23, 29-30 



Bornholm, Denmark, "sing- 

 ing beach" 97 



Botanical Collection of the 



Academy 32 



Boulders in Great Hudson 



Valley 24-26 



of rock-crystal from 

 Alaska 81 



Brazil, minerals from.. 21, 34, 107 



Bridge at Pittsburg, decay of 65-66 



Brilliant colors of red sunsets 32, 



60-61, 64-65 



Building-fund, old, list of sub- 

 scribers 109-111 



Calcite 7, 17 



curious crystals from 



Colorado 19, 20 



California, minerals from. ... 72 

 Cameos, process of cutting . . 105 

 Canada, minerals from ....1,2,7 

 Carbonic acid in the atmos- 

 phere 40-41 



ancient abundance in at- 

 mosphere 91^92 



in natural waters 42 



Carboniferous period, equable 



climate 94 



sharks, armor of 54 



Caribbean Sea, waterspouts in 3 



Carnelian 62 



Carved sandstone head from 



Staten Island 81 



Castings, ancient silver. . 15, 62-65 

 Casts, screw-like, in Chemung 



sandstones 33~34 



Causes of red sunsets .60-61, 64-65 



Ceylon, gems from 17, 107 



Chabazite 18 



Chalcopyrite 23 



Champlain deposits 10, 23 



elevation of 95 



Change in position of the 



earth's axis 89-90, 95 



Charter, Constitution, and By- 

 Laws of Academy. . 1 53-168 

 Chemung Group, fossil fishes. 32 

 screw-like casts 33~34 



Page 



Chesapeake Bay, singing 



beaches on 73-74 



Chili, copper axe from 15 



Chiriqui, gold images 63 



Chlorite i, 50 



Chlorophane, phosphores- 

 cence of 77, 100 



Circulation of the atmosphere 61 

 Clay of the " mud-geysers ".. . 7 

 Climate, alternations of geo- 

 logical 94~96 



of Spitzbergen 85-87 



Colberg, Prussia, " singing 



beach" 98 



Colorado, fossil fishes near 



Green River 13 



fossil insects at Florissant 13 

 fossil palm at Florissant. 77 

 fossil plants at Golden . . "j"] 



minerals from 13 



siliceous sinter 6-7 



silicified wood 6-7 



Coloration of marble loi 



Colored marbles of Lake 



Champlain 100 



Committees appointed 37,71, 



80, 106 



reports of 12, 56-60, 70 



Conglomerate, Shawangunk, 



joints in 23 



separation of blocks of . 29-30 

 Conifer, microscopic structure 



of 87 



Connecticut, minerals from.. 77 

 Constitution of the Academy. 



153-168 



Copper axe from Chili 15 



carbonate 2 



native 2, 19 



ores of Triassic age. . . . 18-19 

 series at Lake Superior. 13-14 



silicate 2 



sulphide i, 2, 18-19 



Corresponding members, elec- 

 tion of. .1, 18,32,37, 48,72 



members, list i26-i;^7 



Secretary, report 68 



Corrosion of iron-wire cables. 



65-66 



Corundum 21, 53 



ancient use in drilling 

 rocks 105 



