1818.] Scientific Intelligence. 457 



In order to find the difference of height of the two stations, 

 take the difference of the logarithms of the heights of the baro- 

 meter at the two stations, using five decimal places. Multiply 

 this difference by 100000, or consider the decimals of the fifth 

 places as unities, and apply A to it, which is found by entering 

 the table with the argument (5 — 3')> and which will be sub- 

 tractive whenever the temperature of the barometer at the lower 

 station is higher than that at the upper station, as is usually the 

 case, and additive when the contrary takes place. Take the 

 logarithm of the result, and add B to "it (entering the table with 



the argument *■—- \ and reject 10 in the index. The result 



will be the logarithm of the height in English feet. 



$, deorees of the attached thermometers at the lower stations, 

 by Fahrenheit's scale. 



$', degrees of the attached thermometers at the upper stations. 



t, degrees of the detached thermometers at the lower stations. 



t' ', degrees of the detached thermometers at the upper stations. 



The result thus found is, perhaps, as accurate as in most 

 es the nature of the observations will allow it to be. La Place, 



