during the Quarter ending December 31, 184-9. 1 13 



28'94(0 on the 7th at 6^ p.m. : this reading increased to 29*600 

 on the 9th at 9^ a.m. ; it was 29* 179 on the 1 Ith at 6^ p.m. ; 

 on the 15th at 6^ p.m. it was 29*796; and it was depressed to 

 29*561 on the 17th at9^^A.M. ; then it increased to 29861 on 

 the 18th at 6*" p.m.; on the 26th at 9^ a.m. it was 29*481, 

 when it began to increase to 30-028 on the 28th at 9^ a.m., still 

 increasing ; on the 29th at 9^ a.m. it was 30*360 ; then it de- 

 creased to 30*250 on the same day at 9^ p.m., still decreasing; 

 it was depressed to 29*180 on the 31st at 9'' p.m. (which 

 makes a fall of 1*070 inch in forty-eight hours), still decreasing. 

 On November 1 at 9^' a.m. it was 29*114 inches: this reading 

 increased to 29*314 on the 2nd at 9'^ a.m., when it decreased 

 again, and was depressed to 28*730 on the 4th at 9^ p.m. ; on 

 the 8th at 3^ p.m. it was 29*996, and it increased to 30*030 on 

 the same day at 9*^ p.m., then it began to decrease ; it was 

 30*020 on the 9th at 9^ a.m., still decreasing; it was 29*247 

 on the 14th at 9^ p.m. ; then it increased to 29*953 on the 

 17th at 9^ P.M.; this decreased to 29*696 on the 18th at 9'^ 

 P.M.; on the 20tli at 9^ a.m. it was 29*802, when it decreased 

 again ; on the 23rd at 9^ p.m. it was 29*000 ; and on the 27th 

 at 3^ P.M. it was 29*825 : this reading decreased to 29*468 on 

 the 30th at 9^ a.m. ; then it increased again. 



On December 1 at 9*^ a.m. it was 29'779 inches ; on the 2nd 

 at 9^ P.M. it was 29*020 ; it increased to 29*248 on the 3rd at 

 9^ P.M.; then it decreased to 28*986 on the 5th at 9^ a.m.; 

 on the 6th at 9^ p.m. it was 29*451 : this reading decreased 

 to 29025 on the 7th at 9^ p.m., then increased again, and 

 was 29*868 on the 10th at 9 p.m.; on the 13th at 9^ p.m. it 

 was 29*488; it increased to 29*520 on the 14lh at 9^ a.m.: 

 this reading decreased to 29*464 on the same day at 9^ p.m. 

 (the dry-bulb thermometer was 53°'8 ; on the same evening a 

 gale of wind blew from the S.W. to W.) ; it increased again, 

 and was 29*660 on the 15th at 9^ p.m. ; then it decreased, and 

 was 29*149 at 9^^ p.m. on the 18th ; it was 29*952 on the 19th 

 at 9^ p.m., still increasing; it was 29*971 on the 20th at 12^ 

 A.M. ; at 1*^ p.m. on the same day it was 29*954 ; then it in- 

 creased to 30*002 at 8^ p.m. on the same day, still increasing; 

 it was 30*243 at 11^ a.m. on the 22nd day : from that day the 

 observations were discontinued. 



The average weight of a cubic foot of air, under the average 

 temperature, humidity and pressure, was 542 grains; agreeing 

 with the average from the eight preceding years. 



The rain fallen at Greenwich in October was 2*7 inches, 

 in November was 1*5, and in December was 2*4. The falls 

 for these three months on an average of thirty-four years, are 

 3*5, 2*7 and 1*5 respectively. 

 PhiU Mag, S. 8. Vol. 36. No. 24 1 . Feb. 1 850. I 



