GEOPHYSICAL INVESTIGATIONS SUGGESTED 201 



6. The possible production of gneissic texture in granite, 



and in basic rocks. 



7. The investigation of the possible recrystallization of 



gypsum under stresses with varying conditions of 

 temperature and moisture. 



8. The same with respect to ice. 



9. The comparison of the original structure and the 



structure resulting from deformation in the case of 

 rocks with those seen under similar circumstances 

 in the case of metals and alloys. 



10. Theories of the effects of mutual compression on 



rocks of dissimilar character and diverse grades of 

 rigidity as bearing on the dynamics of mountain- 

 making. 



X. Effects of motion (flowage) on crystallization. 



1. Relation of the arrangement of primary material in 



bands, stratification, to the development of folia- 

 tion, etc. 



2. Experiments on the production of secondary foliation 



in rocks already foliated. 



XI. Determination of the possible relation behveen chemical affinities 

 a?id stress, 



XII. Determination as to the formation of graphite in metamorphic 

 rocks, whether it requires the presence of organic material 

 under conditions of pressure metamorphism. 



There are, of course, numerous other lines of investigation, as 

 well as elaborations of those here suggested, which may be carried 

 on to the substantial advancement of our knowledge of rocks and 

 minerals and of the consequent physical character of the earth as a 

 whole. 



Frank D. Adams. 



Whitman Cross. 



Joseph P. Iddings. 



James F. Kemp. 



Alfred C. Lane. 



Louis V. Pirsson. 



Henry S. Washington. 



John E. Wolff. 

 October i, 1903. 



14 



