Miscellanies. 183 



MISCELLANIES. 



GEOLOGY. 



1. Outlines of Geology, prepared for the use of the Junior 

 Class of Columbia College ; by Jas. Renwick, LL. D, Prof, of 

 Nat. and Exp. Philos. and Chem. : large 12mo. pa. 96. Printed 

 by Henry Ludwig, 1838. 



The author divides his subject under, 



I. Physical Geography — which inquires into the form and ex- 

 ternal chciracters of our globe. 



II. Geognosy — which examines the nature and relative posi- 

 tion of the materials which compose its external crust. 



III. Geogeny — which investigates the manner and order in 

 which these materials have assumed their present position. 



Physical Geography is treated under the following heads : 



1. Of the figure and density of the earth. 



2. Of the temperature of the crust of the earth. 



3. Of the distribution of land and water on the surface of the 

 globe. 



4. Of the inequalities of the land. 



5. Description of the two great continents. 



6. Of rocks and fossils. 



Geognosy. — The formations are divided as follows : 



Modern formations, under six orders. I. Alluvial. II. Chem- 

 ical. III. Diluvial. IV. Volcanic. 



Ancient formations are either stratified or not. Stratified for- 

 mations are included under five orders : I. Superior. II. Super- 

 medial. III. Medial. IV. Submedial. V. Inferior. — ^Ancient 

 rocks not stratified are included under six orders : I. Granitoid. 

 II. Porphyritic. III. Ophiohtic. IV. Trachytic. V. Trap. VI. 

 Volcanic, 



Geogeny is not divided, except under paragraphs and pages. 

 Of the latter there are 18 ; of the former, 20. 



Physical Geography occupies 25 pages, and 54 paragraphs. 

 Geognosy, 53 pages, and 139 paragraphs. 



It will be seen that the above scheme covers the whole sub- 

 ject. To give even its outlines within the limits of 100 pages, re- 

 quires of course great condensation. This has been effected by 



