546 



Boyal Society : — 



Table showing the aggregate Values of the larger Disturbances of 

 the Declination at the different hours of solar time in 1858, 1859, 

 1860 and 1861, derived from the Kew Photographic Records; 

 with the Ratios of Disturbance at the several hours to the mean 

 hourlv value taken as the Unit. 



Local 

 astrono- 

 mical 

 time. 



Westerly deflections 

 in four years. 



j Easterly deflections 

 in four years. 



Ratios in 



two years. 



Local civil 

 time. 



Aggregate 

 values. 



Ratios. 



Aggregate 

 values. 



Ratios. 



Westerly. 



Easterly. 



Hours. 



Min. of arc. 





Min. of arc. 









Hours. 



18 



860-5 



1-55 



210-9 



0-33 



1-85 



0-37 



6 a.m. 



19 



904-9 



1-63 



221-1 



0-34 



1-83 



0-38 



7 a.m. 



20 



769-7 



1-38 



219-8 



0-34 



1-48 



0-36 



8 a.m. 



21 



732-1 



1-32 



234-3 



0-36 



1-23 



0-38 



9 A.M. 



22 



640-0 



1-15 



245-7 



0-38 



1-26 



0-33 



10 a.m. 



23 



696-3 



1-25 



228-9 



0-35 



1-21 



0-39 



11a.m. 







855-5 



1-54 



234-7 



0-36 



1-38 



0-54 



Noon. 



1 



947-0 



1-70 



218-3 



0-34 



1-44 



0-48 



1 P.M. 



2 



941-6 



1-69 



263-6 



0-41 



1-53 



0-54 



2 P.M. 



3 



954-5 



1-72 



197-5 



0-30 



1-71 



0-34 



3 P.M. 



4 



847-1 



1-52 



265-7 



0-41 



1-35 



0-44 



4 P.M. 



5 



595-1 



1-07 



332-6 



0-51 



115 



0-51 



5 P.M. 



6 



458-7 



0-82 



477-8 



0-74 



0-94 



0-91 



6 P.M. 



7 



272-0 



0-49 



798-6 



1-23 



0-37 



1-19 



7 p.m. 



8 



196-0 



0-35 



962-6 



1-49 



0-22 



1-56 



8 P.M. 



9 



230-9 



0-42 



1184-1 



1-83 



0-29 



1-79 



9 P.M. 



10 



148-6 



0-27 



1512-8 



2-33 



0-20 



2-25 



10 P.M. 



11 



121-9 



0-22 



1615-2 



2-49 



0-12 



2-38 



11 P.M. 



12 



266-5 



0-48 



1471-3 



2-27 



0-49 



2-21 



Midnight. 



13 



245-7 



0-44 



1352-7 



2-09 



0-47 



1-98 



1 A.M. 



14 



306-7 



0-55 



1291-9 



1-99 



0-49 



1-80 



2 a.m. 



15 



287-6 



0-52 



988-0 



1-52 



0-51 



1-45 



3 A.M. 



16 



407-1 



0-73 



702-7 



1-08 



0-97 



0-95 



4 a.m. 



17 



662-9 



1-19 



322-5 



0-50 



1-53 



0-45 



5 a.m. 



Mean "J 

















hourly I 



• 556-2 = 



1-00 



648-1 = 



100 









values J 

















In discussions published elsewhere the preponderance of westerly 

 over easterly deflection, or the converse, has been inferred to be a 

 geographical characteristic rather than an accidental feature. All 

 the stations in North America, at which investigations have hitherto 

 been made, concur in showing a considerable predominance of easterly 

 deflections, whilst at Pekin in Northern Asia the converse is ob- 

 servable. Regarding Kew as the only representative station in the 

 British Islands (the only one in which this investigation has been 

 made), it is deserving of notice, that we find in this locality no con- 

 stant or decided predominance of either class of disturbance over the 

 other. There is indeed a slight preponderance of easterly values on 

 the average of the four years, but not of such amount or regularity 

 as to give it the character of a decided feature. 



" On the Action of Chloride of Iodine on Iodide of Ethylene and 

 Propylene Gas." By Maxwell Simpson, M.B. 



