Meteorological Influence of the Mooii. 67 



matta, — ought to direct particular attention to this point, seeing 

 the great importance of such observations, among other reasons^ 

 for the knowledge they supply concerning the surfaces of diffe- 

 rent celestial bodies, and as exhibiting the comparative lumi- 

 nous effects of our oceans and continents observed at great dis- 

 tances. 



10. On the Meteorological Influence of the Moon. — Here Dr 

 Madler successively reviews the previous researches of Messrs 

 Schiibler, Everets, Eisenlohr, Flaugergues, Boussingault, Alexis 

 and Eugene Bouvard ; to these he adds his own, the result of 

 sixteen years' observations of the barometer, thermometer, and 

 rain-gauge, made at Berlin six times a-day, and still continued 

 by the author. The examination of these observations' has 

 demonstrated that, in this locality, the barometer has a mean 

 elevation of J of a line, and the thermometer of about f of a 

 degree of Reaumur, greater towards the apogee than towards 

 the perigee of the moon, and that there is likewise a somewhat 

 less quantity of rain or snow near the former epoch than near 

 the latter ; but the differences which the several years when 

 grouped two and two together supply, are too great to allow 

 an estimation of the numerical value of these results. As to 

 the influence of the phases of the moon, the author finds that 

 the greatest height of the barometer takes place at Berlin on 

 the day of the new moon, the smallest two days after the 

 full moon, and that the difference of height is 0^,928, with 

 an uncertainty of 0\297. It is sufficiently singular that these 

 epochs should be different from those found in other places ; 

 the epoch which is generally indicated for the maximum of 

 the height of the barometer being the last quarter, and for the 

 minimum the second octant^ or the eleventh day of the moon. 

 As to the thermometer, which no one, we believe, has employed 

 in these investigations previous to M. Madler, he first finds that 

 its maximum of mean elevation is 7°,73 R., and occurs two 

 days before the first quarter, and that the minimum^ which 

 occurs three days after the fourth quarter, is 6°,72 ; supplying 

 a difference of l^Ol, with an uncertainty of 0°,215. 



The greatest rise and fall of the barometer most frequently 

 take place towards the first quarter, and shortly after the full ; 



E 2 



