328 



Mrs Somerville on the Magnetizing Potver 



The following table shows the law of variation from the 

 Equator to the Pole. 



Art. XXIX. — On the Magnetising Power of the more re- 

 frangible rays of Light. By Mrs Mary Somerville. 



We are delighted in having this opportunity of making our 

 readers acquainted with the beautiful experiments on the 

 magnetising property of the violet ray, which have been re- 

 cently made by our accomplished countrywoman, Mrs Somer- 

 ville. 



This subject has been long one of deep interest to the sci- 

 entific world, but it has unfortunately been involved in a de- 

 gree of uncertainty, which is seldom attached to a point of 

 experimental inquiry. 



Dr Morichini, a respectable physician in Rome, discovered 

 this remarkable property of the violet ray. His experiments 

 were successfully repeated by Dr Carpi of Rome, and the 

 Marquis Cosimo Ridolfi at Florence ; but as M. Dhombre 

 Firmas, who resides at Alais, and Professor Configliachi of Pa- 



