326 Extracts from the Journals. [April, 



The foregoing results show that there is little or no difference 

 between the " Mean Temperature,^' obtained by the method of 

 the Regents, or by taking one-third of the daily observations. 

 The results have been the same for years, and the two means will 

 not be given hereafter. By taking one-third of the three daily 

 observationn, taken at the hours prescribed by the Regents in 

 their Instrudions, it will be found to differ but very little from the 

 mean taken as the Regents direct. As the taking of one-third 

 for the mean of each day is much less labor than the other way 

 of obtaining the daily mean, it is respectfully suggested to the 

 Regents, to change the mode of taking the daily mean for that 

 which is the easier, simpler, shorter, and every way more econo- 

 mical. 



It has been shown by taking the observations on the thermo- 

 meter at every hour, or half hour in the day, that the twenty-four 

 parts of those observations, or their mean, is the same as that of 

 the three observations at 7 A. M., and 2 and 9 P. M., or the 

 mean of two observations at 10 A. M. and 10 P. M.; at 6 A. M. 

 and 6 P. M. : 12 at noon and midnight. 



