528 



The following communications were read : 



I. " On the Determination of the Dew-point by means of the 

 Dry- and Wet-Bulb Thermometers/' In a Letter of 

 Lieut. NOBLE, R.N., of Toronto, to CHARLES R.WELD, Esq. 

 Communicated by Professor STOKES, Sec. U.S. Received 

 September 24, 1855. 



Toronto, September 10th, 1855. 



MY DEAK SIR, The results of the accompanying table for com- 

 puting the dew-point from readings of the dry- and wet-bulb thermo- 

 meters, are, as I believe you know, derived from observations taken 

 here during last winter by Mr. Campbell and myself: 



TABLE for computing the Dew-point from Readings of the Dvy- and 

 Wet-Bulb Thermometers. 



