360 Dr. A. Ransoine on some of the 



1842, December 27.— Barom. 2935 in. Sun shining through 

 a dry haze, which continued all day. The lines in the sun's 

 spectrum singularly sharp. 



Apparent time. Arago. 



b ni o i 



11 48 R=26£ max. polarization in zenith plane. 15 50 



j R=23|max. polarization in zenith plane, (1715 

 1J 4 I 14i° in horizon .. .. \ ' 



1 45 R= 24 max. polarization in zenith plane. 20 25 



2 35 R=27i „ „ „ 21 30 



3 15 R = 29i „ „ „ 19 



Babinet. 



12 9 . . . . . . . . 12 25 



1 50 . . . . . . . . 14 40 



2 38 .. .. .. .. 16 5 



1842, December 28.— See Phil. Mag. vol. xxx. pp. 126, 164. 

 1842, December 29.— Barom. 29-50 in. Clear in north. 



Arago. 



1140 .. 15 25 



12 15 29 



Babinet. 



R= 26i° maximum polarization in zenith ) 



11 44 ^ plane. Slight clouds .. V 17 49 



( R=28i° alt. 50°. Sky clearer. ) 



1842, December 30. — Boisterous day; thin white clouds. 



Arago. 



2 R = 22£° max. polarization in zenith plane. 



2 24 .. .. .. .. 15 5 



1842, December 31. — Windy, and sky cloudy. 



11 53 R=27a° max. pol. in zen. Sky impure. 16 40 

 [To be continued.] 



XLIX. On some of the Conditions of Molecular Action. 

 By Arthur Ran some, M.B., M.A. Cantab* 



MANY theories have been broached respecting the ultimate 

 molecular constitution of bodies. The energies of sub- 

 stances have been supposed to depend upon the shape and size 

 of their constituent particles f, their possession of one or more 

 axes of polarity J, their mobility §, and their rotation in various 

 orbits. The phenomena of heat, light, electricity, &c. have also 



* Communicated by the Author, having been read before the Literary 

 and Philosophical Society of Manchester, March 5, 1867. 

 t Dalton, ' New System of Chemical Philosophy/ 

 % Girdlestone, Phil. Mag. S. 4. No. 194, (vol. xxix.) p. 108. 

 § Graham, Phil. Mag. S.4. No. 177, (vol. xxvi.) p. 409. 



