148 Meteorological Axioms, 



8. Between two and fix in the morning and evening it rifei> 

 as often as it falls ; but in fuch a manner that it oftener rifcs 

 about that time in the winter months, and falls oftener in 

 the fummer months. 



9. The ofclUations are Itfs in fummer, greater iii winter, 

 and very great at the equinoxes. 



10., They are greater alfo in the day-time than during the 

 night. 



11. The higher the fun rifes above the horizon, the Icfs 

 are the ofcillations j they increafe as he approaches the weft- 

 em fide of the horizon, and are exceedingly great when he 

 comes oppofite to the eaftern part of the horizon. 



12. They arc, to a certain degree, independent of the 

 changes of temperature. 



13. The mercury generally rifes between the new and the 

 full moon, and falls between the latter and the new moon. 



14. It rifes more in the apogeum than the perigeum : it 

 ufually rifes between the northern luniftice and the fouthern, 

 and falls betvi-een the fouthern luniftice and the northern. 



15. In general, a comparifon of the variations of the mer- 

 cury with the pofitions of the moon gives nothing certain : 

 the refulls of Nos. 13 and 14 are the moft conftant. 



16. In our neighbourhood the barometer never continues 

 twenty-four hours without changing. 



17. The barometers in the weftern diftrifts rife or fall 

 fooner than thofe in the more eaftern. 



18. When the fun pafles the meridian the mercury if 

 falling continues to fall, and its fall is often haftened. 



19. When the mercury at the fame period is rifing, it 

 falls, remains ftationary, or rifes more flovvly. 



ao. When the mercurj', under the fame circumftances, is 

 ftationary, it falls ; unlefs, before or after it becomes ftation- 

 ary, it has been in the acSl of rifing. 



a I. The above changes commonly take place between 

 eleven in the morning and one in the afternoon, but oftener 

 before than after noon. 



aa. Before high tides there is almoft always a great fall 

 of the mercury j this takes place oftener at the full than the 

 new moon. 



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