200 CARNEGIE INSTITUTION 



INVESTIGATION OF MET AMORPHIC ROCKS. 



I. Deterviinatio7i of heat co7iductivity in solid rocks and crystals. 



II. Porosity of rocks. 



{a) With regard to the transmission and circulation of 



water. 

 (J)) With regard to the transmission of gases. 



III. Solubihty of rock-making 7ninerals in water. 



(a) At various temperatures. 

 (3) At various pressures. 



IV. Solubility of rock-making minerals in vapors. 



(a) At various temperatures. 



(b) At various pressures. 



(c) Also in mixtures of water and gases of various kinds, 



dilute acids. 



V. SolutioJi a?id recrystallizatio7i. 



Chemical reactions at various temperatures and pressures. 

 Examples : Wollasto7iite converted to calcite. 

 Calcite converted to ivollasto7iite. 



VI. Physical cha7iges acco77ipa7iyi7ig hydratio7i a7id dehydration. 



VII. Growth of large crystals at the expe7ise of small ones U7ider static 

 co7iditio7is. 

 The development of large, pseudoporphyritic crystals, ottre- 

 lite, staurolite, garnet, etc., in certain schists. 



VIII. Solutio7i a7id recrystallizatio7i of strai7ied crystals of rock-t7iaki7ig 

 jni7ierals, and of other salts. 



IX. Cha7iges resulti7ig from diffe7'ential stresses. 



1 . Determination of the relation between the rate of de- 



formation and the strength of the deformed rock. 



2. Relation between the amount of deformation and the 



degree of pressure producing it. 



3. The resistance offered by rocks to deformation. 



4. The deformation of hot rocks in the presence of water. 



5. The relative degrees of deformation experienced by 



given rocks at different temperatures and with 

 different content of water, for different pressures, 

 with limestone, marble, sandstone, granite, etc. 



