1&6 Miscellaneous TnteUigence, 



up from daily observations from 19th October 1808 to 18th October 

 1827, a period of nineteen years. The observations were made in 

 the observatory at Viviers, 2^ 20' 55. "5 loncritude east of Paris, 

 and 44° 29' I" north latitude. The basin of the barometer was 

 56.78 metres (186.3 feet) above the level of the Mediterranean. 

 Mid-day was chosen for the time of observation, because the height 

 of the barometer is not sensibly affected at that time by the sun. 



T ... Number of Mean heie-ht in 



Lunar positions. Observations. millimeters. 



General mean height 6915 755.44 



New moon or conjunction 234 755.39 



First octant 234 755.37 



First quadrature 234 . 755.37 



Second octant 235 754.65 



Full moon or opposition 234 755.23 



Third octant 234 755.70 



Second quadrature 234 756.32 



Fourth octant 235 755.48 



Northern lunistice 258 755.73 



Southern lunistice 258 755.42 



Lunar Perigee 252.; 754.72 



Lunar Apogee 252 755.82 



The conclusions drawn by M. Flaugergues are — 1. That the ba- 

 rometer rises from the second octant when it is lowest, to the se- 

 cond quadrature when it is highest, and then again descends to the 

 first point: the total variation is 1.67 miUimeters (.0657 of an inch). 

 Thus in a lunar day, the barometer is lowest when the moon is 

 135° from the meridian towards the east; i. e., 9 hours 18j minutes 

 of mean time before its passage across the meridian, or 6 hours 

 12j minutes after its passage. 2, The action of the moon is 

 stronger when its declination is southern than when it is .northern, 

 contrary to the theory of Laplace. 3. The difference between the 

 actions of the moon at the apogee and perigee, is 1.1 millimeter 

 of the latter greater than the former. The author finally concludes 

 that the number of rainy days is greater when the barometric 

 pressure is diminished than when it is augmented. — Bib. Univ.t 

 Dec. 1827. 



5. — On the Arravgeinent of JVater Pipes in Streets. — The effect 

 of temperature upon iron pipes, used for the conveyance of water, 

 and also some other circumstances have been investigated by M. 

 Girard: he has arrived at the following conclusions. 1. According 

 to the effect produced by change of season and temperature upon 

 pipes of this metal placed in subterraneous galleries, they altered in 

 length for each centesimal degree (1.8 degrees of Fahr.), 0.0000985, 

 a quantity about -^ less than it would have been if they had not 

 been confined on their supports by friction. 2. Although this effect 

 is less when the pipes are put in the ground, it is still sufficient to 

 occasion rupture, leakages, and other unpleasant accidents. 3. If the 



