196 THE MAGNETIC EFFECTS OF LIGHT. [MEMOIR XII. 



netic, I tried the same experiment, but in every instance 

 failed to make the needle magnetic. When suspended 

 by a silk fibre in vacuo needles showed no disposition 

 to arrange themselves in any particular direction, and 

 when they came to rest were found cutting the magnetic 

 meridian at every angle, though the temperature of the 

 sunbeam to which they had been exposed on one occa- 

 sion was 124. Great care was taken to ascertain the 

 previous non- magnetic state of the needles, and they 

 were suspended by a fibre without torsion. 



