314 



Dr. C. Chree on Deductions from 



§ 8. Table V. advances the evidence of the statement made 

 above, that the annual incidence of storms differs in years 

 of many and of few sun-spots. The data are the times 

 assigned for the commencement of the 726 storms included 

 in Mr. Maunder's two lists, The year is divided into three 

 seasons : Winter (November to February), Equinox (March, 

 April, September, October), and Summer (May to August) ; 

 the monthly results are given in the order mentioned, i. e., 

 month 1 denotes November, March, or May, according as the 

 season is Winter, Equinox, or Summer. In the case of the 

 whole 56 years the results for the M storms are given as well 

 as for the "All" storms. In the case of the S max. and 

 S min. years — which represent the same years as in Tables III. 

 and IV. — only the results for " All " storms are given. 



Table V. 



Mouth. 



Winter. 



Equinox. 



Summer. 



56 years. 



S 

 max. 



S 

 min. 



56 years. 



S 

 max. 



21 



S 

 min. 



19 



56 years. 



S 

 max. 



10 



S 

 min. 



12 



All. 



M. 



All. 



74 



M. 



48 



All. 

 46 



M. 

 27 



1 



56 



27 



24 



7 



2 



40 



21 



15 



2 



75 



40 



28 



9 



40 



18 



16 



6 



3 



59 



37 



18 



14 j 75 



43 



21 



11 



45 



24 



21 



3 | 



4 



78 



33 



34 



13 83 



40 



28 



22 



55 



34 



22 



9 ! 



Total .,. 



233 



118 



91 



36 307 



m 



44 



98 

 38 



61 



48 



186 

 26 



103 

 26 



69 

 27 



30 

 24 



Percentage 



32 



30 



35 



28 



42 



The total number of storms is too small, especially in the 

 S min. group of years, to give smooth results for an annual 

 variation, and much weight cannot be assigned to the data 

 for individual months. But taking the seasons, there seems 

 an unmistakable difference between S max. and S min. years, 

 at least in Winter and Equinox. The tendency in S max. 

 years is obviously towards a more regular distribution of 

 storms throughout the year. The phenomena are in short 

 exactly analogous to what we have already seen to be true 

 of the diurnal distribution. Also, as the difference between 

 " All " and M storms from the 56 years is, if existent, 

 exceedingly small, the difference between the S max. and 



