Injury from Cold During Growing Period. 133 



Example: Dry-bulb reading ............. 47 



Wet-bulb reading ............ 40 



Wet-bulb depression ......... 7 



Table for Computing the Dew Point in Degrees 



Fahrenheit. 



Opposite 47, in the left hand column, and under 7 

 in the top line, we find 28 the dew point. If these 

 readings are obtained toward sunset on a clear, still 

 evening, we should expect frost, because the dew point 



