Bigelow — Meteorological Elements of the United States. 419 



Table IV. — Annual Variations of the Temperature. 







Pacific 





Eoeky Slope. 



C entral-Eastern . 



Y6&r. 























T. 



M. 



T.-M. 



T. 



M. 



T.-M. 



T. 



M. 



T.-M. 



1873 









-0-9 



—0-4 



-0-5 



-1-2 



-1-2 



o-o 



74 









+ 



8 



-0-6 



+ 1 



4 



+ 



3 



-0-9 



+ 1-2 



75 









-1 



7 



-0-5 



-1 



2 



—2 



7 



-0-5 



-2-2 



76 











-0 



9 



o-o 



-0 



9 



-0 



3 



+ 0-2 



-0-5 



77 









+ 



3 



+ 0-2 



+ 



1 



+ 1 



3 



+ 0-3 



+ 1-1 



78 



+ V 8 



+ 6 



2 



+b"-6 



+ 1 







+ 0.3 



+ 



6 



+ 2 



3 



+ 1-0 



+ 1-3 



79 



+ 0-4 











+ 0-4 



+ 1 



li 



+ 0-5 



+ 1 







+ 



7 



+ 1-4 



-0-7 



1880 



-1-8 



-0 



4 



-1-4 



-0 



3 



+ 0-7 



-1 







+ 1 



2 



+ 1-3 



-o-i 



81 



-0-3 



-0 



7 



+ 0-4 



+ 



2 



+ 0-5 



-0 



3 



+ 1 



3 



+ 0-7 



+ 0-6 



82 



-1-1 



-0 



9 



-0-2 



+1 



1 



+ 0-1 



+ 1 







+ 1 



1 



+ 0-6 



+ 0-5 



83 



-0-5 



-0 



2 



-0-3 



-0 



2 



o-o 



-0 



2 



-0 



7 



-o-i 



-0-7 



84 



-0-9 







(l 



-0-9 



-0 



6 



-02 



-0 



3 



+ 



1 



-0-5 



+ 0-6 



85 



+ 1-8 



+ 



2 



+ 1-6 



-0 



8 



-0-4 



-0 



4 



-2 







-0-8 



-1-2 



86 



+ 0-2 



+ 



5 



-0-3 



-0 



8 



-0-4 



-0 



4 



-1 



2 



-0-9 



-0-3 



87 



+ 0-4 



+ 1 



li 



-0-6 



+ 



4 



—0-3 



+ 



7 



-0 



1 



-0-9 



+ 0-8 



88 



+ 1-2 



+ 



6 



+ 0-6 



-0 



5 



+ 0-1 



-0 



6 



-1 



5 



-0-4 



-1-1 



89 



+ 1-2 



+ 



6 



+ 0-6 



+ 



2 



+o-i 



+ 



1 



+ 



3 



00 



+ 0-3 



1890 



-02 



+ 



4 



-0-6 



+ 1 







-o-i 



+ 1 



1 



+ 



7 



-o-i 



+ 0-8 



91 



+ 0-2 



-0 



1 



+ 0-3 



-0 



7 



-o-i 



-0 



6 



+ 



ii 



o-o 



+ 0-6 



92 



-0-2 



-0 



6 



+ 0-4 



-0 



7 



o-o 



-0 



7 



-0 



6 



+ 0-2 



-0-8 



93 



-1-6 



-0 



ii 



-1-0 



-0 



1 



-0-4 



+ 



:; 



-1 



1 



-0-1 



-1-0 



94 



-1-1 



-0 



6 



-0-5 



+ 



6 



-o-i 



+ 



7 



+1 



3 



-o-i 



+ 1-4 



95 



—0-6 



-0 



6 



o-o 



-1 



3 



+ 0-1 



-1 



4 



-0 



7 



+ 0-1 



-0-8 



96 



+ 0-4 



-0 



3 



+ 0-7 



+ 



8 



+ 0-1 



+ 



7 



+ 



6 



+ 0-5 



4 0-1 



97 



o-o 



-0 



2 



+ 0-2 



+ 



4 



-o-i 



+ 



5 



+ 



5 



+ 0-3 



+ 0-2 



98 



-0-2 



+ 



2 



-0-4 



-0 



1 



+ 0-4 



-0 



r> 



+ 1 



o 



+ 0-7 



+ 0-3 



99 



-0-4 



+ 



1 



-0-5 



-0 



4 



+ 0-3 



-0 



7 



+ 



2 



+ 0-6 



-0-4 



1900 



+ 1-0 











+ 1-0 



+ 1 



1 



+ 03 



+ 



8 



+1 



3 



+ 0-5 



+ 0-8 



01 



+ 0-3 











+ 0-3 



+ 



6 



+ 0-2 



+ 



4 



-0 



3 



+ 0-2 



-0-5 



02 



-0-5 



+ 



2 



-0-7 



+ 



5 



+ 0-3 



+ 



2 



+ 



3 



—o-i 



+ 0-4 



03 



-0-5 











-05 



-0 



9 



-o-i 



-0 



8 



-0 



3 



-06 



+ 0-3 



04 



+ 0-8 



+ 



1 



+ 0-7 



+ 



1 



-0-3 



+ 



4 



-1 



9 



-0-8 



-1-1 



05 



+ 0-2 



+ 



2 



o-o 



-0 



li 



-0-3 



-0 



3 



-0 



li 



1 -0-7 



+ 0-1 



nate the zero-point correction, as well as that for the slope of 

 the curves due to the change in the mean value of the hori- 

 zontal force during the month. Then, the amplitudes or 

 departures of the minor crests from the mean line were scaled 

 off from day to day, and their sum taken out for the month, 

 the average sum for the stations employed being entered in 

 Table III. The magnetic field varies in its intensity, and these 

 amplitude numbers are a relative measure of the intensity 

 itself, whatever may be the physical cause of the same. These 

 relative numbers may, perhaps, be improved by closer compu- 

 tations covering more stations, but they are sufficient for our 

 present purpose, which is to exhibit the evidence of solar and 

 terrestrial synchronism, by using easily accessible data. It 

 may be observed that the monthly means for the interval 1872- 

 1905 possess the same semi-annual period as the solar promi- 



