116 



DISCUSSION or THE ANNUAL FLUCTUATION 



ANNUAL FLUCTUATION 



[The angle S counts from January I, 



Long. 

 W.ofGr, 



Extent 

 Height. of 



Series. 



ARCTIC REGIONS. 



Polaris Bay, Hall Land 



Van Rensselaer Harbor, N. Greenland 

 Port roull<e, North Greenland . . 

 Port Kennedy, North Somerset . . 



8i°38' 



78 37 

 78 18 

 72 01 



6i°i4' 

 70 53 

 73 00 

 94 14 



feet. 



yrs. mos. 









34 



I 



+4°. 19 



33-09 



247°r2' 



6 



I 8 



— 2.20 



35-79 



25 > 43 



6 



II 



+ 6.06 



33-49 



242 14 



4 



I I 



-)- 2.02 



39-46 



249 05 



BRITISH NORTH AMERICA AND CANADA. 



Fort Franklin, Great Bear Lake . 

 Fort Chipewayan, Athabasca Lake 



Nain, Labrador 



Toronto, Canada West .... 



65 12 



58 43 

 57 10 

 43 39 



122 45 

 III 15 



6i 50 

 79 23 



230 

 700 



+ 17.1S 

 +28.69 

 +23.46 

 +44.26 



37-64 

 34-36 

 25.09 

 22.37 



248 55 

 246 55 

 241 18 

 246 II 



ALASKA. 



I Through the courtesy of Dr. E. Bessels, who had charge of the scientific observations in the Hall Polar expedition, 

 I have received in advance of the publication, the monthly mean temperatures as observed at Polaris Bay, between 

 Sept. 1871, and Aug. 1872, together with some other information bearing on the same. 



These results are given in the table below, to which I have added a reduction to refer them to months of average 

 length, also the results computed by the formula — 

 r= + 4°. 19 + 33.09 sin (6+247° 52') + 7-15 sin (2S + Si^.g) + 1.83 sin (3^ + 51°) + 2.59 sin (48+211°). 



477 



9 

 10 



gitka 



57 03 



53 54 



135 20 

 166 24 



20 

 20 



16 II 



7 I 



+42.09 

 +37-56 



12.38 

 10.08 



234 47 



lUoolook, Unalaska Island 



235 51 



For the fourth term the correction for curvature ■ 



amounts to nearly -^ of £^. 



Polaris Bay, Hall Land. 





Observed 













Temp. 





Temp, for 





Obs'd.— 





Calendar 



Red'n. 



Average 



Comp'd. 



Com'd. 





Month. 





Month. 







1S72 January 



— 22°. 42 



— °.OI 



— 22°.43 



—22°. 78 



+ °-3S 



p'ebniary 



—23-52 



+.01 



—23-51 



—24.15 



+ -64 



March 



—22.65 



+-17 



—22.48 



—21.98 



— -50 



April 



— 7.66 



+ -56 



— 7.10 



— 8.95 



+ 1.85 



May 



+ 17-59 



+.20 



--17.79 



+ 19.19 



—1.40 



June 



+36-94 



+.05 



--36.99 



+37-27 



— .28 



July 



+39.28 



— .01 



--39-27 



+39-24 



+ -03 



August 



+35-88 



+ .05 



+35-93 



+37-21 



—1.28 



187 1 September 



+23.07 



— 76 



+22.31 



+ 21.62 



+ -69 



October 



— I-S9 



— 03 



— 1.62 



— I. II 



— -51 



November 



— 8.76 



— .22 



— 8.98 



— 10.17 



+ 1.19 



December 



—15-79 



—.09 



—15.88 



— 15.11 



— -77 



