PREFACE. 



enlargement is ample, and would willingly be entered 

 upon, were sufficient promise of encouragement afforded 

 by the public. 



The annual summary of " Notes by the Editor on the 

 Progress of Science ' has been considerably enlarged, 

 and embraces several topics of interest, which could not 

 conveniently be included in the body of the work. 



We present our readers for 1853 with a portrait of 

 Prof. ALEXANDER DALLAS BACHE, President of the 

 American Association for 1850-51, and Superintendent 

 of the United States Coast Survey. 



BOSTON, February, 1853. 



