376 Magnetic Influence of Solar Light. 



This Table it will be observed, gives precisely the same 

 difference of 0.4 " as the last, and hence furnishes no sup- 

 port to the Magnetic Theory. 



TABLE III. 



Shewing Duration of Oscillations of Testing Needle with Cylinder C in front, 

 before and after exposure. 



Medium-Light Red Glass C. 



• ft 

 o 



o m 



Feb. 

 18th 



Hours of 

 Expos. 



From 



A. M. 



103 



To 



P. M 



2| 



o 

 -3 



Temp. 



o , 



In. 



0-05 



<U 02 



M S. 



WW 



C2 : 



QJ O 



S ft 



92o 



Sums, ... 



Means. 



Duration of 

 Oscillations. 



| No. of < 



Before | 

 Expos. 



After 

 Expos. 



10 



89 



87 



10 



88 



87 



10 



88 



87 



10 



88 



87 



10 



88 



87 



50 



44-1 



435 



10 



88-5 



87 



Remarks 



The difference of 1.5 " exhibited in the preceding expe- 

 riments arises, I have no doubt, from mere error of observa- 

 tion, or as remarked before, possibly from the unequally 

 exposed portions of the cylinder affecting the testing needle. 

 No indications, however, of magnetic polarity could by any 

 means be obtained with the cylinder, and I therefore infer 

 no such polarity existed it." 



