Mr. W. Brown on the Oscillations of the Barometer. 267 



light: 9 p.m. S.W., almost calm. 9. Storm from S.W., which 

 began early in the morning and continued till 5 p.m., at which 

 time the wind had sunk down to a calm with rain ; the barometer 

 being then at its minimum, 29*276. The calm continued through 

 the night, with a hoar frost. 10. 9 a.m. W.N.W., very light; 

 sky clear, but soon afterwards overcast: 2 p.m., wind extremely 

 light and variable; rain falling: 9 p.m. wind strong from S.E., 

 which continued, with heavy rain, all night; and until after- 

 noon of the 11th, on which day the air became again calm in the 

 evening. 12. 9 a.m. "W.N.W., very light wind: 9 p.m. strong 

 from N.W. 13. 9 a.m. and 2 p.m. wind extremely light from 

 W.S.W. and S.W. ; in the evening strong from N.E., with rain. 

 14. N.E., brisk. 15. N.E., brisk, with showers during the day, 

 and strong at night. 16. N.E. and E.N.E., strong. 17. 9 a.m. 

 E., very light; calm during the remainder of the day. 18. 

 W.S.W., very light during most of the day, but strong at night. 

 19. Morning, W.S.W., brisk: evening, light from W.N.W., 

 slight rain. 20. N.E., rather brisk; showers in the evening and 

 during the night. 21. N. to N.W., rather brisk in the middle of 

 the day; showers. 22. Morning, strong from S. S.W. ; changed 

 to S.W. in the afternoon, and sunk down to a calm in the even- 

 ing; rain and snow. 23. N.W., rather brisk. 24. A storm, 

 with rain from S.S.E., which abated towards evening. 25. S.S.E., 

 strong till evening, when the air became calm ; fine showers. 

 26. S.S.W. and S.W., light; rain in the evening." 



The Tables which follow contain the indications of the ba- 

 rometer from the 1st to the 26th; each day is divided into 

 three columns ; the second and third contain the observations 

 for morning and evening, and the middle one those of the 

 middle of the day. The hours of observation are given after 

 the names of the places, which are placed in the order from 

 north to south, but the western before the eastern. In a co- 

 lumn previous to those containing the daily indications are 

 given the mean heights of the barometer for each place, in 

 order that the daily heights may be compared with each 

 other*, in which comparison the difference of pressure due 

 to the latitude ought to be borne in mind. With the excep- 

 tion of the observations at Paris, Christiania, and North Shields, 

 which are reduced to the temperature of 32° Fahr., the num- 

 bers are those which are read off from the barometer ; as, 



* It is not meant by this to be understood that these means are given 

 as representing by their differences the differences of height of the several 

 barometers as read off from each scale, supposing them placed in juxtapo- 

 sition, but only to serve in the following observations for standards for the 

 comparison of their variations with each other in the absence of any other 

 method of doing it; but the unusual equality of the mean pressure of the 

 atmosphere of this month over so large a space, renders the means chosen 

 sufficiently accurate for this purpose. 



