vi Notice to Correspondents. 



" Geber Secundus" has much amused us: we hope to hear more 

 of him. 



Several communications particularly intended for insertion in the 

 present Number, reached us much too late. We again entreat our 

 correspondents to forward all papers intended for immediate pub- 

 lication, on or before the Jirst days of December, March, June, and 

 September. 



To a correspondent who consults us upon the subject of Manure 

 we earnestly recommend a trial of coarsely-ground bones : his vici- 

 nity to the Metropolis renders the supply easy. We believe the 

 application to be very effective and permanent. 



We are quite indifferent upon the subject of the Edinburgh Con-' 

 troversy. E. S. knows that we lohg ago anticipated what has now 

 come to pass, nevertheless we are obliged by his activity. 



The system of re-printing papers published by learned societies is 

 inconsistent with our plan, but F. R. S. E. will find a full report of 

 the Essay he alluded to in our Eighth Volume. 



" Geologicus" must address himself to the fountain-head. 



The pencils sent us by Mr. Mitchell appear to be made of pow- 

 dered plumbago and sulphur, the latter having been melted. 



