proposed ly the Geological Society. 427 



If UnstratifieJ. 



1 8. Are they amorphous, columnar, or in globular concretions? 



1 9. Do they split with the same ease in all directions, or have 

 thev what is called a grain ? 



20. Do they abound in fissures, and what is the direction and 

 extent of these ? 



§ IX. Concerning the Materials of Rocks. 



1 . Are they composed of one mineral substance, or of more ? 

 In the latter case, which has impressed the other ? 



2. Are they composed of parts cemented together, or adhering 

 to each other without a cement ? 



o. Are they granular, slaty, porphyritic, amygdaloidal, or any 

 compound of these ? If breccia, are the included nodules large 

 or small, entire or broken, &c. ? 



4. Do thev contain fragments of other rocks, and of what 

 description ? 'Sand ? Shells ? Corals ? Vegetable impressions, or 

 any thing that appears to belong to a different formation ? 



5. Are there hollow nodules, and in what manner are they 

 lined ? 



6. Is there any character, by which substances found in one 

 stratum can be distinguished from similar substances found in 

 another ? or by which, what have been called primary strata may 

 be distinguished from secondary strata, and strata of transition? 



7. What minerals are found to be generally concomitants of 

 others ? 



8. How are the several species affected by the combined ac- 

 tion of air and moisture? Where large fragments have been 

 torn by torrents from known rocks, what is the progress of their 

 decomposition, and is there any re-aggregation ' . 



i). What are the characteristic forms of each species of rock, 

 — in mountains ? 

 —in detached blocks ? 



10. How are thev affected by peat moss lying on them ? 



11. What are the plants, the presence or absence of which 

 indicates the nature of the soil? 



12. By what local denominations are the different rocks di- 

 stinguished, and to what oeconomical purposes are th6y applied ? 



§ X. Concerning Feins. 



1. Are they of the same materials as the rock in which they 

 occur^ or of any contiguous rock ? 



2. What is their direction with regard to the points of the 

 compass, and the inclination of the adjacent strata ? 



I 3. Are they vertical, horizontal;, or inclined, and at what an- 



^^^^' 4. What 



