the late Balfour Steivart. 263 



areas is further discussed in a paper written jointly with 

 Mr. W. L. Carpenter {Proc. Roy. Soc, Vol. XXXVII., p. i, 

 1884). The authors describe the results of their calculation 

 as follows : 



a. Sun spot inequalities around 24 and 26 days, whether 

 apparent or real, seem to correspond closely in period with 

 terrestrial inequalites as exhibited by the daily temperature 

 range at Toronto and at Kew. 



/3. While the sun spot and the Kew temperature range 

 inequalities present evidence of a single oscillation, the 

 corresponding Toronto temperature range inequalities pre- 

 sent evidence of a double oscillation. 



y. Setting the inequalities as we have done, the sun spot 

 maximum occurs about eight or nine days after one of the 

 Toronto maxima, and the Kew maximum about seven days 

 after the same Toronto maximum. 



^. The proportional oscillation exhibited by the tem- 

 perature range inequalities is much less than that exhibited 

 by the corresponding solar inequalities. 



They add : " It must be borne in mind that the truth of 

 a connexion between celestial and terrestrial phenomena 

 can only be decided by cumulative evidence of various 

 kinds. 



" What we claim to have here done is to have given 

 reasons for supposing that there is a correspondence in time 

 scale, and a definite relation in type and phase between sun 

 spot and temperature range inequalities." 



Similar results are obtained from a comparison by the 

 same authors between apparent inequalities of short period 

 in sun spot areas and diurnal declination ranges at Toronto 

 and Prague. 



The sun spot period, with its average duration of about 

 eleven years, shows very great irregularities both in the 

 length and amplitude of the oscillation. Stewart has shown 

 (^Mein. Mane. Lit. and Phil^ that from the year 1780 to 1870 



