CONTENTS. 
PAGE. 
Introduction 5 
Methods which may be used in the Determination of Elastic Constants of Materials 6 
Application of the Method of Simple Compression to the Determination of the Com- 
pressibility of Metals 12 
Application of the Method of Simple Compression to the Determination of the Com- 
pressibility of Rocks . 15 
The Method of Measurement 20 
The Elastic Constants of Rocks Composed of a Single Mineral: 
Marbles and Limestones 
1. Black Belgian Marble (" Noir Fin ") 24 
2. White Carrara Marble 26 
3. White Vermont Marble 28 
4. Tennessee Marble (" Pink Tennessee ") 29 
5. Fossiliferous Trenton Limestone, Montreal, Canada 31 
The Elastic Constants of Rocks Composed of more than one Mineral: 
Acid Plutonic Rocks 
Granite 
6. Granite Baveno, Italy 33 
7. Granite Peterhead, Scotland , 36 
8. Granite Lily Lake, New Brunswick, Canada 37 
9. Granite Westerly, Rhode Island, U. S. A.. . . 40 
10. Granite Quincy, Massachusetts, U. S. A 42 
11. Granite Stanstead, Province of Quebec, Canada 43 
Nepheline Syenite: 
12. Nepheline Syenite, Montreal, Canada 47 
Basic Plutonic Rocks 
13. Anorthosite, New Glasgow, Province of Quebec, Canada 50 
14. Essexite, Mount Johnson, Province of Quebec, Canada 52 
15. Green Gabbro, New Glasgow, Province of Quebec, Canada. 55 
16. Olivine Diabase, Sudbury, Province of Ontario, Canada 57 
Sedimentary Rocks (Clastic) 
17. Sandstone, Cleveland, Ohio 60 
The Elastic Constants of Glass 62 
Summary of Results 66 
