226 



Intelligence and Miscellaneous Articles. 



t. 



X=656. 



X= 589-2. 



n , , , •, 1 Differences 

 Calculated | from the 



intensities. < observed- 



Calculated 

 intensities. 



Differences 

 from the 

 observed. 



o 



775 



954 



1045 



1500 



1775 



"i 



30 

 161 



507 



"6 



-03 



+7 

 



004 



1 



32 

 219 

 807 



-001 





 -04 





 _2 



t. 



X=535. 



A =482. 



Calculated 

 intensities. 



Differences 

 from the 

 observed. 



Calculated 

 intensities. 



Differences 

 from the 

 observed. 



954 



1045 



1500 



1775 



1 



34 

 311 

 1371 





 -0-3 



+4 

 +6 



142 

 807 



1 



5-7 



The calculations were made with the values of a which appeared 

 to accord best with the observations. These values, 



1-02713, 1-02772, 1-02838, 1-02935, 

 satisfy the formula a=l-03550 — 13\, with the respective differ- 

 ences 



-0-00016, +0-00012, +0-00015, -0-00012. 



The experiments of Dulong and Petit are equally well repre- 

 sented by the same formula, assuming a=l*01161, — that is to say, 

 supposing \=1838, which is perfectly admissible according to the 

 measurements of M. Mouton, who has determined the wave- 

 lengths up to 2140. We have, in fact : — 



Excess. 



Velocity of cooling. 



A. 



Determined 

 by Dulong 

 and Petit. 



Calculated by 

 my formula. 



o 



80 



100 



120 



140 



160 



180 



200 



220 



240 



1-74 

 230 

 302 

 3-88 

 489 

 610 

 7-40 

 8-81 

 1069 



1-71 

 2-35 

 310 

 3-97 

 4-96 

 610 

 7-39 

 8-84 

 10-46 



-003 

 +0-05 

 +008 

 +009 

 +0-07 





 -0-01 

 +0-03 

 -0-23 



