NOTICES TO CORRESPONDENTS. 



Professor Hansteen's Paper on the variation of the Needle will appear in 

 next Number. His comparison of the Leith and Christiania Hourly Observations 

 will also appear in next Number. 



We have received the communication of W. J. H. and shall be glad to hear from 

 him frequently. 



J. S.'s elaborate paper was submitted to a gentleman who had made the subject 

 his particular study. If he favours us with his address, we shall have the pleasure 

 of communicating with him on the subject. 



It would be gratifying to us if A could arrange a less circuitous method of com- 

 munication. 



