CONTENTS. xiii 



Variety, — Serpentine, 152-lGl. 



Fitztowu, Pennsylvania, 152. Frankenstein, Silesia, 1-52. Leko, Norway, 152. 

 Waldheim, Saxony, 153. Thessaly, 153. Santiago, San Domingo, 153, 154. 

 La Vega, San Domingo, 15-1. Brixlegg, Tyrol, 154. II Piano, Elba, 154, 155. 

 Tasmania, 155. Windisch-Matrey, Tyrol, 155. St. Sabine, France, 155, 156. 

 River Oisain, Timor, 15G. Pdviere des Plantes, Canada, 156. Melbourne, Canada, 

 156. Galioia, Spain, 156. High Bridge, New Jersey, 156, 157. Ziiblitz, Sax- 

 ony, 157, 158. Chip Flat, California, 158. Depot Hill, California, 158. Plumas 

 Co., California, 158. Finland, 1.58. Ivlopf berg, Austria, 159. Nezeros, Thes- 

 saly, 159. Fatu Temanu, Timor, 159. Westfield, Massachusetts, 159, 160. 

 Formation of Talc, 159. Lynnfield, Massachusetts, 160. Iliver Joa, San 

 Domingo, 160. Newport, Vermont, 161. Celinac, Austria, 161. Texas, Penn- 

 sylvania, 161. Chester, Pennsylvania, 161. 



Variety. — Porodite, 161, 162. 

 Fatu Luka, Timor, 161, 162. Strand, Timor, 162. 



SECTION V. 



Peeidotite. — Its Macroscopic Characters 162-165 



Structure of the Meteoric Peridotites, 162. Structure of tlie Terrestrial 

 Peridotites, 163-165 ; least altered forms, 163; alteration characters, 163. Ap- 

 pearance of the Olivine Groundmass, 163. Alteration of the Pyroxene Minerals, 

 163, 164. Segregations in Serpentine, 164. Translucency of Serpentine, 164. 

 " Slickensides " in Serpentine, 161. Products of extended alteration in Perido- 

 tite, 164. Term Serpeiiiiiie in Mineralogy, 164. Variability of Serpentine, 164; 

 Schistose Structure in, 164. Production of Talc and Actinolite Schists, 164, 165 ; 

 of Dolomitic Limestones, 165. Fragmental states of Peridotite, 165. Origin of 

 Ophicalcites and brecciated Serpentines, 165. Introduction of the terms MeroUte 

 and MerolUic for pseudo-fragmental rocks, 165. 



SECTION YL 



Peeidotite. — Its Microscopic Characters 16.5-175 



General Microscopic Structure of the Meteoric Peridotites, 165-167. The Base 

 of, 166. The Chondri of, 166. The Olivine of, 166. The Enstatite of, 166. 

 The Iron and Pyrrhotite of, 166, 167. The Chromite and Picotite of, 166. 

 The Manbhoom Saxonite, 167. Union of Diallage and Augite Cleav;ige in Dial- 

 lage, 167. Lherzolite, 167. INIinor minerals in Jleteoric Peridotites, 167. Frag- 

 mental Meteorites, 187. Microscopic characters of the Terrestrial Peridotites, 

 168-175; of Dunite, 168; alteration to Serpentine, 168. Transition in the 

 varieties of Peridotite, 168. Characters of Enstatite, 168, 169 ; of Diallage, 169 ; 

 of Augite, 169. Alteration of the Pyroxene Minerals, 169. Description of the 

 alterations in the Peridotites as shown in the plates, 169-172. The Eozouii ques- 

 tion, 172-174. Organic structure simulated in Felsites, 173. Tiie supposed 

 Eozoon, and otlier organisms, the more perfect, the more the rock is altered, 173. 

 The inclination to unduly extend one's line of study, 173, 174. Crucial test in 

 disputed problems, 174. The Eozoon in segregated or veinstone deposits, there- 

 fore not of organic origin, 174. Microscopic characters of Picrite, 174, 175. 



