334 



METEOROLOGY. 



observed, that tlie MencTon values are the monthly means, vs^hich do 

 not always fall on the 15th day, but nearly at that time. 



Bate fer hour of the sun's intensity. — To glance at the subject from 

 another point of view, let us consider the rate, or the relative num- 

 ber of heating rays per hour. For any day, if we divide the com- 

 puted intensity by the length of the day, the quotient will express 

 the average hourly intensity. 



In the accompanying table the values of the rate are exhibited at 

 intervals of fifteen days, and for every ten decrees of latitude. Tlie 

 peculiar variation of the values for latitude 70° evidently arises from- 

 the change to constant day. And apparently the hourly rates coin- 

 cide more nearly with the temperatures than do the diurnal inten- 

 sities or absolute amounts. 



Average rate of the sun's hourly intensity, or relative number of 

 vertical rays ^jer hour. 



A. D. 1853. 



Jan. 1. 

 Jan. IG. 

 Jan. 31- 

 Feb. 15. 



Mar. 2. 

 Mar. 17- 



April 1 _ 



April IG. 

 May 1 - 

 May 16. 



May 31- 

 June 15. 

 July 1. 

 July 16- 



July 31. 

 Aug. 15- 



Aug. 30- 

 Sept. 14- 



Sept. 29- 

 Oct. 14. 

 Oct. 29. 

 Nov. 13- 

 Nov. 28. 

 Dec. 13- 



G. 43 

 6.51 

 6.63 

 6.75 

 6.80 

 6.83 



6.73 



6.58 

 6.40 

 6.23 



6.08 

 6.00 

 6.01 

 6.08 



6.22 

 0. 39 



6.54 

 6. 64 



6.70 

 6.73 

 6.66 

 6.56 

 6.46 

 6. 40 



5.89 

 5.99 

 6.20 

 6.38 

 6.59 

 6.70 



6.71 



6.67 

 6.59 



6.48 



6.39 

 6.33 

 6.32 

 6.38 



6.46 

 6.56 



6.60 

 6. GO 



6.57 



6.47 



6.29 



6.12 



5.9 



5.86 



5.16 

 5.32 

 5.56 

 5.85 

 6.11 

 6.38 



6.50 



6. 5G 

 6.57 

 6.53 



6.49 

 6.45 

 6.44 

 6.46 



6.50 

 6.50 



6.48 

 6.37 



6.21 

 6.01 

 5.74 

 5.48 

 5. 26 

 5. 13 



4.24 

 4.44 

 4.66 

 5.05 

 5.50 

 5.85 



6.09 



6.21 

 6.33 

 6.40 



6.36 

 6.34 

 6.36 

 6.37 



6.32 

 6.30 



6.12 

 5.92 



5.68 

 5.36 

 5.00 

 4.72 

 4.42 

 4.25 



3.26 

 3.44 

 3.86 

 4.27 

 4.71 

 5.15 



5.51 



5.70 

 5.86 

 6.01 



6.07 

 6.07 

 6. 12 

 6.01 



5.98 

 5.87 



4.93 

 4.53 

 4.08 

 3.75 

 3.36 

 3.28 



2.08 

 2.32 

 2.75 

 3.22 

 3.78 

 4.25 



4.73 



5.02 

 5.32 

 5.46 



5.54 

 5.57 

 5.58 

 5.51 



5.42 

 5.23 



4.87 

 4.70 



4.05 

 3.58 

 3.09 

 2.66 



2.28 

 2. 06 



0.88 

 1.12 

 1.56 

 2.11 

 2.70 

 3.17 



3.82 



4.24 

 4.50 

 4.71 



4.78 

 4.81 

 4.83 

 4.75 



4.05 

 3.68 



3.16 

 2.56 

 2.00 

 1.48 

 1.08 

 0.87 



0.34 

 0.92 

 1.56 

 2.21 



2.76 



.3.22 

 3.52 

 3.55 



3.62 

 3.82 

 3.78 

 3.51 



3.55 

 3.43 



3. 10 

 2.61 



2.04 

 1.42 

 0.80 

 0. 25 



0.35 

 1.03 



1.64 



1.83 

 2.68 

 3.35 



3 79 

 4.00 

 3 96 

 3.68 



3.18 



2.47 



1. 90 

 1.50 



0.89 

 0.22 



0.86 



1.86 

 2.72 

 3.40 



3.85 

 4.07 

 4.03 

 3.74 



3.22 

 2.50 



1.62 

 0.61 



A close agreement, however^ could not reasonably be expected ; for 

 the intensities represent the sun's effect at the summit of the atmos- 

 phere, but the temperatures at its base. Indeed, the sun's intensity 



