on Magnetic Rotatory Polarization in Gases. 409 



rotations due to the passage of the luminous rays through 

 these glasses. Besides the determinations which follow, a 

 great number of others were made before the apparatus had 

 received its definite and final form. However, the average of 

 the results found previously is identical with that which is 

 deduced from the following numbers: — 



Atmospheric Air. 





Average 



Average 



Correction, 



Numbers 



Corrected 



Mean 



Series. 



tempera- 

 ture, t. 



pressure, 

 H. 



(1+O760 



observed and 

 corrections. 



magnetic 

 rotations. 



devia- 

 tions. 



H 



White light (incandescent lime). — 4th image (9 passages). 





1st. Measurements without the tube-glasses. (Former arrangement of the apparatus.) 



| 1 millim. 





1 





May 13, 1879. | 30-7 | 764'0 



1-100 



6-17 1 6-78 



11 



Final arrangement. 





Jan. 16, 1880. 



10-0 



763-2 1-033 



6-56 1 1 













Mirrors 0*28 



1 6-48 



1-8 











Diff. 6-28 



J 





March 19, 1880. 



16-0 



768-0 



1-048 



6-44 



Mirrors 0'28 



I 645 



1-0 











Diff. 6-16 J 





2nd. Measurements with the tube-glasses. 





Jan. 19, 1880. 



16-5 



762-8 



1-056 



10-74 



Corr. 4-58 



Diff. 6-16 



I 6-50 



10 



March 11, 1880. 



14-0 



801-3 



1032 



10-92 



Corr. 4-58 



Diff. 6-34 



1 6-54 



1-6 



3rd image (7 passages). 





March 6, 1880. 



21-0 



791-8 



1-033 



8-77 

 Corr. 3-79 



Diff. 498 



I 5-14 



1-1 



Yellow light (yellow glass). — 4th image (9 passages). 





1st. Measurements without the glasses. 





March 19, 1880. 



20-7 



767-9 



1064 



615 



I 6-18 













Mirrors 0-28 



0-8 











Diff. 5-87 





„ (2nd series). 



35-0 



766-3 



1-119 



505 

 Mirrors 0*28 



Diff. 4-77 



| 5-34 



0-4 



