Meteorological Observations at Hudson, Ohio. 315 



will be observed that these extraordinary fluctuations occur 

 chiefly in winter; not one occurred in the siuTimer months. The 

 same remark applies to the table of maxima and minima given 

 before. 



It appears, then, that spring is the driest season, and April the 

 driest month of the year ; winter is the most humid season, and 

 December the most humid month. The amount of vapor in the 

 air varies but little with the hour of the day, the mean difference 

 in the dew point at 9 A. M. and 3 P. M. being less than two de- 

 grees. The preceding observations do not furnish us directly the 



