TABLE OF CONTENTS. 281 



Page. 

 M. Fragmental rocks — Continued. 



(2) Volcanic fragmental rocks (tuffs) 453 



(a) Definition, origin, and composition 463 



(&) Varieties of 453 



(c) Localities and uses of 453 



(3) Argillaceous fragmental rocks (clay slates) 464 



(a) Composition and structure 464 



(b) Uses of 465 



(c) Slates of various States and Territories 466 



(d) Catlinite or Indian pipe-stone 471 



Part III. 



STONES OF OTHER COUNTRIES. 



A. Alabaster 473 



Alabaster of Italy 473 



B. Serpen tinous rocks. Verdantique marbles 473 



English serpentine 473 



Italian serpentine 474 



C. Limestone and marbles : 



(1) Limestone and marbles of Africa 475 



(2) Limestones and marbles of Belgium 476 



(3) Limestone of Bermuda 477 



(4 ) Limestones and marbles of England 477 



(5) Limestone and marbles of France 478 



(6) Limestone and marbles of Germany and Austria 479 



(7) Limestone and marbles of Italy 480 



(8) Limestone and marbles of Japan 482 



(9) Limestones and marbles of Mexico 482 



(10) Limestones and marbles of Spain and Portugal 483 



D. Granitic rocks: 



(1) Egypt 484 



(2) British provinces of North America 485 



(3) Scotland 485 



E. Quartz porphyries 486 



F. Sandstones: 



( 1 ) Sandstones of the British provinces of North America 486 



(2) Sandstones of Scotland 487 



G. Slates: 



(1) Slates of Canada 488 



(2) Slates of Great Britain 488 



Part IV. 



APPENDICES. 



Appendix A. The qualities of building stones as shown by their crushing 

 strength, weight, ratios of absorption, and chemical com- 

 position 489 



(1) Remarks on methods and utility of testing stone 489 



(2) Modulus of elasticity 492 



