648 



REPORT ON NATIONAL MUSEUM, 1886. 



Page. 



Virginia, diabase in 436 



granites in 426 



gypsum in 370 



marbles in 391 



sandstones in 461 



slates in 471 



soap-stone in 300 



specimen of amphibolite from 606 



specimen of biotite scbist from 606 



specimen of calcareous dolomite [mar- 

 ble] from 605 



specimen of dolomite f marble J from 605 



specimen of muscovite granite from 606 



specimens of biotite granito from 606 



specimens of biotite gneiss from 606 



specimens of diabase from 606 



specimens of gypsum from 605 



specimens of limestono [marble] from.. 605 

 specimens of magnesian limestono [mar- 

 ble] from 605 



specimens of sandstone from 606 



specimens of slate from 606 



specimens of stalagmite marble from. .. 605 



specimens of steatite [soap-stone] from. 605 



Viridite, description of... 209 



Vitreous, definition of 525 



Vitreous rocks 302 



Volcanic fragmental rocks 463 



W. 



Wadsworth, Dr., on induration of sand- 

 stone 339 



Ward well cbanneling machine 312 



Ward well, George J., invented channeling 



macb ine 321 



Wa verly group of rocks in Ohio 456 



Page. 



"Washington Territory, sandstones in 461 



specimens of sandstones from 607 



Weathering of building stones 331 



Weathering properties of stones 340 



"Wedges in splitting stone, use*of 314 



Wedge used in stone-working described.. . 330 



"West Indies, export of slate to 291 



West Virginia, sandstones in 462 



specimen of limestone [marble] from... 606 

 specimen of magnesian limestone [mar- 

 ble] from 600 



specimens of sandstone from 606,607 



White crystalline limestone, structure of. . . 304 



statuary marble, Italy 480 



or blocK marble, Italy 480 



Williamsite, Pennsylvania 368 



Wincbell, Professor, on Trenton limestone 



in Minnesota 401 



on weathering of Trenton limestone 343 



Wisconsin, granites in 426 



limestones and dolomites in 406 



porphyry in 428 



sandstones in 461 



specimen of biotite gneiss from 608 



specimen of bornblende granite from . . . 608 



specimens of dolomite from 607, 608 



specimens of granite from 608 



specimens of qnartzite from 609 



specimens of quartz porphyry from 608 



specimens of sandstone from 608,609 



Wyoming, granites in 425 



specimen of hornblende granite from . . 609 



specimens of granito from 609 



V. 



Yellow marbles, Italy 481 



or Siena marble, I taly 461 



