SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE. 



METEOROLOGICAL OBSERVATIONS 



MADE NEAR 



WASHINGTON, ARK., 



EXTENDING OVER A PERIOD OF TWENTY YEARS, 

 FROM 1S40 TO 1859, INCLUSIVE. 



NATHAN D. SMITH, M.D. 



[accepted FOit PUBLICATION, J A N U A K Y , I860.] 



