32 On the Velocity of Sound. 



obviating the effects of wind. The following Table contains the 

 results of about forty observations. The thermometer was the 

 only meteorological instrument employed at the time. 



The mean of the Table gives a velocity of 1069-28 feet, at the 

 temperature of — 9° 14'; but this temperature being substituted 

 in the formula gives only 1011.83 feet, which is too small by 

 57.45 feet. 



In the Philosophical Magazine for June 1824, may be seen a 

 very particular account of a vast number of experiments made 

 with great care by Dr Gregory, in the vicinity of Woolwich, 

 and which give just as little countenance to theory as those men- 

 tioned above. To these, Dr Gregory has annexed an abstract 

 of Mr Goldingham's experiments, which were made at compa- 

 ratively high temperatures in the torrid zone. They deviate in 

 all manner of ways from theory. 



Henry Meikle. 



Eocaminaticm of' the Experiments hitherto published on Subter- 

 ' ranean Temperature, together with Experiments and In- 

 quiries relative to this Examination. By M. L. Cordier, 

 Member of the Royal Academy of Sciences, and Professor 

 of Geology in the Garden of Plants. (Concluded from last 

 Volume, p. 291 *.) 



X HE running waters of mines are much less calculated to af- 

 ford correct indications than the springs and filtrations. They 

 commonly arise from the union of several rills having different 

 origins. According to the local circumstances and the length of 

 their course, they are more or less affected in their temperature, 



• The reader is requested to correct a typographical error in last volume, 

 page 291, where Temperature of Puisards, or engine-pits, is erroneously sub- 

 stituted for Temperature of Springs* 



