und Moon on the Atmofphere. aj^^ 



^endently of the operation of the laft-mentioned caufes, I 

 took the following method: Faffing regularly through the 

 f egirter of the barometer which I had chofen for examina- 

 tion, T extraftcd one obfervation for eaeh lunar week, as 

 near as poffible to the time of the change, which I ranged 

 under its proper title, either new moon or full, &c. Having 

 gone through the year, I took the mean of the whole of 

 thefe notations, and afterwards the mean of thofe under the 

 title of new moon, full moon, firft and lall quarter, refpec- 

 tively ; by comparifon of which with the general mean I at- 

 tained my objeft. 



The annexed regifter being examined thus, by taking the 

 numbers marked on the plate under each change, the refahs 

 were as follows : 



It will appear, by infpefting the plate, that if the numbers 

 had been taken with a latitude of only 2,^ hours on eiUier 

 fide the moon's changes, the refults would have been ftill 

 ni«re favourable to the fuppofed coincidence. 



The regifter of the Royal Society, given in the Philofo- 

 phical Tranfaftions, affording an opportunity of trying it oa 

 a much larger fcale, I extrafted weekly obfervations for ten 

 years, viz, from 1787 to 96, adhering ftri£tly to the rule E 

 tad laid down, and compared the mean of each clafs with 

 the mean of the whole for ten years, as alfo with the mean 

 of the regifter at large for that time, which gave the follow- 

 ing refults. 



Meancf the Whole. N?w Moon. Firft Qnarter. Full Moon. Laft Quirter. 



29,818 29,7946 29,8-^10 29,7812 29,8823 



Difference from tl. I _^^^^^ +.0730 -,0368 +,0643 



Total M«an. J 



The mean of the regifter at large appeared (on computation 

 from the mean of each year as given in the regifter) to be 

 29,89, whence it appears that the depreffions at the new and 

 fall moon either amounted to more, on the whole, than the 

 elevations at the quarters, or that they fell out nearer to thi 

 Q time. 



