CONTENTS- Xi 



Lincolnite, - -- -- -- -- 437 



Theory of Greenstone, - - 439 



porphyry : Its definition, - 442 



Its Mineralogical Characters, ------ 443 



Its Topography, - 447 



Its Geological Position, 448 



Mineral Contents, - - 449 



Theory of Porphyry, - ------ 450 



sienite : Its definition, 451 



Its Mineralogical Characters, 452 



Its Topography, 455 



Its Pseudo-Stratification: Veins in Sienite, - - - 456 



Its Geological Position, - - 460 



Mineral Contents, - 461 



Theory of Sienite, - 462 



granite : Its definition, - 465 



Its mineralogical Characters, ------ 466 



Its Topography, - ----- 469 



Its pseudo-Stratification : Phenomena of Veins and Protruding 



Masses of Granite, 473 



Mineral Contents, 501 



Theory of Granite, 509 



Theory of Central Heat, ------- 516 



Fluvial Theory, 518 



miscellaneous items. 



Origin of Metallic Veins, Beds, &c 520 



Direction and Dip of Metallic Veins and Beds in Massachusetts, 521 



Elevation of Mountains and Systems of Strata in Massachusetts, 522 



Explanation of the Sections and Map of the Direction of Strata, 523 



Systeuis of Strata of cotemporaneous Elevation in Massachusetts, 525 



Oldest Meridional System, - - - - - - 526 



The Trap System, 528 



The Latest Meridional System, 530 



The North East and South West System, - 531 



East and West System, 534 



Northwest and Southeast System, 535 



Ancient Deluges, - - - 537 



Theory concerning the Force by which Systems of Strata were 



elevated at Successive Epochs, ------ 538 



Concluding Remarks, 539 



PART IV. CATALOGUES OF ANIMALS AND PLANTS. 



Introductory Remarks, ----- 543 

 Catalogue of Mammalia in Massachusetts, - 544 

 ■ of Birds in do. - 545 



