82 CARNKGIE INSTITUTION OF WASHINGTON. 



4. Helps and hints (auxiliary elements) : (a) Geological and 

 mineralogical chemistry, (d) General works on microscopic pe- 

 trography, (c) Rock analysis, (d) Synthetical procedures (unity 

 of forces in geology, unity of forces in nature, conservation and 

 transformation of energy, unity of science). 



5. Paleo-climatology : (a) General and synthetical, (d) Analytic. 



6. Structural geology : (a) Sedimentation, (d) Metamorphism 

 (mechanical, physical, chemical), (c) Epeirogeny. (d) Orogeny. 

 (c) Isostasy. (/) Thermodynamics, (g) Experimental investi- 

 gations. 



7. Dynamic geology : (a) External forces, (d) Erosion, (c) 

 Earth's crust, (d) Temperature changes in depth, (e) Interior 

 of the earth. (/) Geological time. 



8. Volcanology : (a) Theory of vulcanism. (d) Distribution of 

 volcanoes, (c) General and synthetical works on volcanoes, (d) 

 Particular and analytic works on volcanoes. (<?) Theories of in- 

 trusion. (/) Geysers, hot .springs, etc. (g) Experimental inves- 

 tigations. 



9. Seismology : (a) Seismometry. (d) Earthquakes, generally 

 and synthetically, (c) Earthquakes, particularly and analytically. 



10. Glaciology : (a) Theories of glacial age. (6) Theories of 

 glacial motion, (c) Experimental investigations. 



11. Terrestrial magnetism. 



12. Physical properties of minerals, rocks, and magmas : (a) Con- 

 stants. (/;) Fusion and solidification. (<:) Rock synthesis, (d) De- 

 formation. ((?) Jointing and faulting. (/) Viscosity of magmas, 

 (^) Diffusion of magmas, (h) Mineral solutions. 



The number of titles entered on cards October i, 1904, is 6,566. 

 The first section of the bibliography, entitled " Synthetical Geo- 

 physics," is nearly ready, and will form a volume of about 200 pages. 

 The bibliography will include references from the third century. 



