1823.3 Mr, Goldinghdm on the Vetocity of Sourid* 207 



experiments having been made during a limited period only, and 

 at unfavourable times for obtaining a mean result, instead of the 

 interval which appears by these experiments to be necessary. 



A particular examination of the Tables and results will show 

 the difficulty of ascertaining what proportion of the differences 

 should be allowed to each of the instruments used for finding 

 the state of atmosphere, exclusive of the effects of the wind. 



During the calms, we might expect that the proportional parts 

 to be allowed for the difference in the thermometer, barometer, 

 and hygrometer, might be found with some degree of accuracy ; 

 the discrepancies, however, are very considerable. Comparing 

 the results of Tables II. and VII. we find the barometer 0-121 

 lower, the thermometer 4*6° higher, and the air about Si more 

 dry by the former Table than by the latter, while the velocity 

 in a second is only 17*7 feet greater by one Table than the 

 other. 



We give, however, in addition the following results taken 

 from the Tables of calms, and arranged according to the differ- 

 ent heights of the thermometer and barometer. These results 

 may assist us in coming to some conclusion upon this part of 

 the subject. 



Where the changes are so numerous and so frequent as in the 

 atmosphere of the earth, we cannot expect that our imperfect 

 instruments will be of a construction sufficiently delicate to show 

 accurately every alteration that may affect the motion of the 

 pulses of the air ; but by various comparisons and combinations 

 of the results, we may hope to arrive at general conclusions, 

 somewhat approaching the truth. 



♦ These are deduced from 100 observations. 



