304 Royal Society : — Rev. G. C. Hodgkinson's Actinometrical 

 1841. December 5. 



Apparent time, 

 h m 



1 1 a.m. R = 25^° in zenith plane. 

 1841, December 7. — Neutral line convex towards the sun. 



Babinet. 



8 51 AJtf. .. .. .. .. 15 4 



1841, December 11.— Barom. 29'4 in.; therm. 41°. 



Arago. 



3 46 R=28i° in zenith, and at 20° above horizon. 18 27 

 3 51 .. .. .. .. 16 16 



Although the sky appeared free of clouds, yet upon close exa- 

 mination extremely faint and transparent clouds reflecting no 

 light, but rather darker than the sky, covered the whole heavens. 



1841, December 17. — Beautiful morning. 



9 7 a.m. R=27i° in S.W. horizon. BabInet * 

 9 13 „ Neutral line concave to sun . . 13 10 



10 30 „ R=27i° in zenith plane; 25£° at 30° above N.E. hor. 



1841, December 18. — Splendid sky; without a cloud. 



8 53 .. .. .. .. 15 55 



Arago. 



9 8 .. .. .. .. 19 52 



At 9 h the maximum polarization R = 28 in zenith plane, and 

 far beyond 90° from the sun. 



3 17 p.m. .. .. .. .. 19 5 



3 32 „ .. .. .. .. 17 25 



Uabinet. 



3 22 „ R= 28° in zenith ; 27i° in horizon. 17 20 

 3 36 „ . . . . . . . . 18 25 



1841, December 22. — Fine frosty day ; clear sky. 



9 23 . . . . . . . . 14 10 



Arago. 



9 33 .. 20 10 



K=27i°in zenith plane; 24J in S.W. horizon, and 26J° 

 at 10° above. 



[To be continued.] 



XLI. Proceedings of Learned Societies, 



ROYAL SOCIETY. 



[Continued from p. 233.] 



Jan. 17, 1867. — William Spottiswoode, Esq., Vice-President, in the 



Chair. 



fPHE following communication was read : — 

 ■*- " Actinometrical Observations among the Alps, with the De- 

 scription of a new Actinometer." By the Rev. George C. Hodgkin- 

 son. In a Letter to Professor Stokes, Sec. R.S. 



Sir, — I have the honour to forward you an account of some acti- 



