1^2 On the Moon*s Influence on the Atmofphere, &c. 



its letter denfity. This had heen already proved hy M. l'abbd 

 Chiminelle, {Nouv. Mem. de V Acad, de Berlin 177b, p. 45, 

 de VHiJloire\ Journal de Thyjique 1782, 2nde partie, p. 88 j 

 Mh?i. fur I: Meteor, torn, 1, p. 617.) The barometograph 

 of M. Changeux indicated daily tides, and they have alio 

 been obferved at Calcutta in Bengal. {Vide Philofophical 

 Magazine, vol. vii, p. 363.) 



The new form in which I have arranged my regifters in 

 order to facilitate my examination of C. Lamarck's Theory of 

 Lunar Con fti nations, {Journal de Vhyjique 1801, 2d part, 

 p. 222.) has likewife ferved very conveniently to verify the 

 refults announced by Mr. Howard. I have noted, during 

 the fpace of 34 years and 5 months, (from the ill of Janu- 

 ary 1768 to the 22d of May 1802,) the afcending and de- 

 fending direction of the barometer in each of the fizygies 

 and quarters of the moon which have occurred through that 

 period of time. I here ftate the total fum of the elevations 

 and depreffions of the mercury at each of the phafes : 



For 34J- Years. New Moon, lit Quar. lull Moon. ' za Qu-ir. 



Sum of elevations 218 296 199 290 times, 

 of depreffions 281 229 279 106 



Differences 6$ 6 J 80 84 



Thefe refults of near 35 years obfervations confirm, as will 

 be feen, the conclufions drawn by Mr. Howard, both from 

 his obfervations for one year at Plaiftow, and thofe made for 

 ten years in the Royal Society's apartments. 



It is to be remarked, ift, That the four numbers which 

 exprefs the differences between the" elevations and depreffions 

 are nearly in an exact proportion, flnce 63 : 67 : : 80 : 85 T . 



2dly, That the two latter phafes, viz. the full moon and 

 laft quarter, have more effect than the two firffc. 



^dly, I have examined what phafes of the moon have cor- 

 responded to the greateft and leaft height of the mercury for 

 each month during ten years, and have* obtained the follow- 

 ing refults : 



For ten Years. New Moon. 1 ft Quar. Full Moon. 2d Quar. 



Greateft elevation 



occurred at 26 40 %6 28 times. 



Greateft depreffion 



occurred at 30 34 29 27 



Differences 4631 



The fcience may be therefore faid to have advanced one 

 ftep further towards perfection on this occafion ; and it is 

 to be hoped that, by redoubling our diligence in multiplying 



obfervations, 



