﻿252 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Ordovician 
  system, 
  see 
  Lower 
  Silurian 
  

  

  system. 
  

   OrgRDic 
  rocks, 
  125'''. 
  

   Orisk;.ny 
  saiidstoue, 
  1573, 
  1591, 
  1912. 
  

   Orleans 
  county, 
  hydraulic 
  cement, 
  156^. 
  

   Orthoclase, 
  1211, 
  1251. 
  

   Oswego 
  county, 
  Hudson 
  river 
  group, 
  

  

  1496. 
  

   Outcrops, 
  2383-394. 
  . 
  

   Oysters, 
  1732 
  ; 
  of 
  Tertiary 
  period, 
  175'^. 
  

  

  Packard, 
  AS., 
  First 
  lessons 
  in 
  zoology, 
  . 
  

   extract 
  from, 
  132. 
  

  

  Palaeontology, 
  1293-302. 
  See 
  also 
  Fos- 
  

   sils. 
  

  

  Palaeozoic 
  series, 
  1416-70^; 
  outcrops 
  

   in 
  New 
  York, 
  1846, 
  2429-432. 
  

  

  Palaeozoic 
  time, 
  1358. 
  

  

  Palisades, 
  igneous 
  rocks, 
  124^, 
  140*, 
  

   171'^; 
  trap-rocks, 
  184*, 
  204^. 
  

  

  Peat, 
  227'7. 
  

  

  Pentamerus 
  limestones, 
  2015. 
  

  

  Periods, 
  1361. 
  

  

  Permian 
  formation, 
  169^-701. 
  

  

  Petriiaed 
  wood, 
  1791. 
  

  

  Petroleum, 
  2278. 
  

  

  Phosphate 
  of 
  lime, 
  localities 
  producing, 
  

   2338. 
  

  

  Photographs, 
  IIO8-III. 
  

  

  Physiography 
  of 
  New 
  York, 
  1341-353. 
  

  

  Plagioclase, 
  1213-1251. 
  

  

  Plants, 
  classification, 
  1331 
  ; 
  develop- 
  

   ment, 
  1421, 
  169^; 
  of 
  Cambrian 
  sys- 
  

   tem, 
  1463; 
  of 
  Carboniferous 
  system, 
  

   1705 
  ; 
  of 
  Devonian 
  system, 
  165^ 
  ; 
  of 
  

   Mesozoic 
  time, 
  170"^; 
  of 
  Tertiary 
  

   period, 
  175'^; 
  of 
  Upper 
  Silurian 
  sys- 
  

   tem, 
  158*. 
  

  

  Pliocene, 
  1749. 
  

  

  Plutonic 
  rocks, 
  124*, 
  1252, 
  1392. 
  

  

  Pocouo 
  group, 
  1665. 
  

  

  Porphyry, 
  1253. 
  

  

  Portage 
  group, 
  1642, 
  193*. 
  

  

  Potsdam 
  group, 
  1428, 
  144*-459. 
  

  

  Potsdam 
  sandstone, 
  1445-455, 
  1875-883. 
  

  

  Potter's 
  clay, 
  1208, 
  

  

  Pottery, 
  manufacture 
  of, 
  1742. 
  

  

  Pottsville, 
  conglomerate, 
  1672-698. 
  

  

  Precious 
  metals, 
  see 
  Gold 
  ; 
  Silver. 
  

  

  Proterozoic 
  series, 
  141*. 
  

  

  Proterozoic 
  time, 
  1358. 
  

  

  Putnam, 
  B. 
  F., 
  article 
  on 
  iron 
  ores, 
  

  

  2145. 
  

   Putnam 
  county, 
  calciferous 
  limestone, 
  

  

  1473. 
  

   Pyrite, 
  localities 
  producing, 
  2319. 
  

   Pyroxene, 
  12^, 
  1219, 
  i82*. 
  

   Pythagoras, 
  geologic 
  observations, 
  

  

  113'^. 
  

  

  Quartz, 
  1205, 
  1209, 
  1252, 
  2249. 
  

   Quartzite, 
  1206, 
  143*. 
  

   Quaternary 
  system, 
  1758-79*; 
  fossils 
  of, 
  

   1786-79*. 
  

  

  Red 
  sandstone, 
  171'^, 
  1951. 
  

  

  Eeindeer, 
  fossil, 
  1789. 
  

  

  Eensselaer 
  county, 
  rocks, 
  1433; 
  fossils, 
  

   1438 
  ; 
  roofing 
  slate, 
  1441. 
  

  

  Rensselaer 
  plateau, 
  1519-521. 
  

  

  Eeptiles, 
  of 
  Carboniferous 
  system, 
  

   170*; 
  of 
  Cretaceous 
  period, 
  1746; 
  of 
  

   Jurassic 
  period, 
  1726 
  j 
  of 
  Mesozoic 
  

   time, 
  170'^: 
  of 
  Tertiary 
  period, 
  1756; 
  

   of 
  Triassic 
  period, 
  1722. 
  

  

  Rbyolite, 
  1253. 
  

  

  Ries, 
  Dr. 
  Heinrich, 
  photographs 
  by, 
  

   1109. 
  

  

  Road 
  metal, 
  1596, 
  184'?, 
  1915, 
  204*-82 
  ; 
  

   quarries, 
  2045-56; 
  requisite 
  qualities, 
  

   2078. 
  

  

  Rock 
  cities, 
  1676. 
  

  

  Rock 
  salt, 
  122'7, 
  1256. 
  

  

  Rockland 
  county, 
  calciferous 
  lime- 
  

   stone, 
  1473. 
  

  

  Rocks, 
  1231-262; 
  defined, 
  119"^. 
  See 
  also 
  

   Igneous 
  rocks; 
  Metamorphic 
  rocks; 
  

   Sedimentary^ 
  rocks. 
  

  

  Roofing 
  slate, 
  126i, 
  1433, 
  1439-441, 
  196^. 
  

  

  Rosenbusch 
  classification, 
  1248-253. 
  

  

  Rossie 
  hematites, 
  2196. 
  

  

  Rubies, 
  1228. 
  

  

  