No. 151.] 207 



Then the earthquakes; atmospheric cfFects on the earlh and its 

 surface; coral works; upheaved strata; coal measures thus displaced; 

 the injection of fused granite into oAer rocks; metalliferous veins; 

 the relative ages of the convulsions of the earth. 



Dr. Ruschenberger has in this little volume, which is sold for fifty 

 cents, given a just summary of a mass of investigation contained in 

 books which would cost a large sum of money to purchase and some 

 months to read, lie has added to it an explanation of all the hard 

 tcords used. 



Your committee with much pleasure recommend this highly valu- 

 able book to the attention of those who conduct our schools, acade- 

 mies, colleges, &c., as a work excelently calculated to give the first 

 outlines of the very important study of geology to students. Nor 

 do we hesitate to say that all men, except the learned geologists 

 alone, will feel after its perusal, that they have received a great re- 

 ward for a very small expense of time and money. 



(Signed,) J AS. J. MAPES, 



February 4th, 1846. 



