On Mineralogical Surveys. 357 



2. — Description of the surface of the country, a. Ranges 

 of mountains, extent, mode of connexion, shape, acclivities ; 

 heights, as ascertained by the barometer or sympesometer. 

 p. Single mountains, shape, acclivities, magnitude, height. 

 y. Valleys, extent, shape, character of cliffs and precipices, 

 inclination and nature of the bottom, height above the level 

 of the sea, and mode of connexion with neighbouring valleys. 

 £. Plains, extent, appearance of their surface, including 

 lands, steppes, deserts, oases, &c. height above the sea. £. 

 Caves and caverns, their position, how formed, rocks in 

 which they occurred, contents. 



3. — Description of rivers, magnitude, under which is in- 

 cluded their length, breadth, and depth ; direction and fall ; 

 velocity ; inundations and their effects, retardations, eddies, 

 &c. ; height above the level of the sea at different points of 

 their course ; nature of their bank ; character of their scene- 

 ry ; comparison of their former with their present state ; bars 

 at their mouths, and deltas ; physical and chemical proper- 

 ties of their water ; quantity of sediment contained in their 

 waters at different seasons of the year ; temperature ; and, 

 lastly, description of the animals and plants that inhabit 

 them. 



4. — Description of lakes, formation, situation, distribution, 

 magnitude, under which is included their length, breadth, 

 circumference, and depth ; temperature at different depths ; 

 colour ; height above the level of the sea ; chemical proper- 

 ties of their waters ; animals they contain, plants that grow 

 in them ; character of their scenery. 



5. — Description of springs, magnitude, temperature, height 

 above the level of the sea ; rocks from which they issue ; their 

 chemical and physical properties, incrustations found around 

 them ; quantity of matter brought from the interior of the 

 earth by them ; geognostical situation and geographic distri- 

 bution ; animals that occur in them, and plants that grow 

 in their vicinity. 



