196 CARNEGIE INSTITUTION 



II. Determination of the Behavior of Solutions of Min- 



erals IN One Another. 



A. With tiormal atmospheric pressure . 



1. The temperature at which two minerals will go into solu- 



tion in one another, and the temperature of solidification 

 of the mixed solution. 

 For various pairs of rock-making minerals such as — 

 Quartz and orthoclase. 

 Orthoclase and albite. 

 Orthoclase and pyroxene. 

 Pyroxene and olivine. 



2. The point of saturation in each case for various tempera- 



tures. 



3. The solution of gases in liquid minerals and rocks. 



(«) The rate of absorption (see also Diffusion, head- 

 ing III) and the limit of saturation for differ- 

 ent temperatures, 



(J)) The relation between the composition of the 

 liquid mineral or rock and the limit of satu- 

 ration. 



(^) The effect of dissolved gases on the viscosity of 

 the liquid rocks. 



B. With high pressure in closed vessels. 



The influence of increasing pressure on the solution of 

 various minerals in one another, on the saturation and 

 solidifying point, and on the solution of gases in the 

 liquid rock and on the limit of saturation, especially the 

 effect of dissoh^ed gases in liquid rock under high press- 

 ure on the viscosity of the liquid. (See Diffusion, below.) 



III. Determination of the Rates of Diffusion in Liquid 



Rocks and Minerals. 



A. With normal atmosphei'ic pressure. 



1. The rate of heat conductivity in solid and liquid rocks 



and minerals at various temperatures. 



2. The rate of absorption and transmission of various gases 



in liquid rocks of different compositions. 



