Ch. XL] THE PRIMARY ROCKS. 229 



3. Are the primary schistose rocks sedimentary deposits, 

 altered by the contact of igneous rocks ? 



4. Do the primary rocks afford physical evidence that they 

 have experienced fissures, dislocations, and other mechanical 

 movements ? 



5. May not all the phenomena of the primary rocks, both 

 stratified and unstratiried, be satisfactorily explained on the 

 supposition that these rocks are of contemporaneous origin ? 



Q 3 



