TO READERS AND CORRESPONDENTS. 



Communications have been received from Dr. Mac CuUoch, from the 

 Medico-Botanical Society, from Mr. Rmnbal, Mr. Swainson, Dr. 

 Goring, and several anonymous Correspondents, which, either from the 

 lateness of their arrival, or from want of space, wx have been under the 

 necessity of postponing. 



It is quite out of oiu- power to comply with the wishes of many of our 

 Correspondents for extra copies of their papers. Were all their requests 

 acceded to, it would be impossible that this Journal could be printed and 

 published at the appointed time, and we obviously can make no distinc- 

 tion. We therefore trust that our refusal will be considered as a matter 

 of necessity, and not arising out of want of courtesy or consideration. 



AH manuscripts sent us for publication are invariably destroyed as 

 soon as the number in which they are printed is published, except we 

 receive a special request that they may be returned to the authors, 

 which is always attended to. 



We are much obliged by the trouble taken by our Correspondent, 

 N. R. D. The pump is certainly not new, and probably not good for 

 much, or it would have come into more general use. The other sug- 

 gestions are not forgotten, 



A letter has reached us, signed " An Amateur." We trust that the 

 present Number will meet his views. 



The communication upon the subject of the recent discussions in the 

 Royal Society is omitted, for reasons which w^e presume will be suffi- 

 ciently obvious to the communicator ; but the subject shall not be lost 

 sight of. 



Works in the Press^ 



Some Account of the Science of Botany ; being the Substance of an Introductory 

 Lecture delivered in the Theatre of the Royal histitution of Great Britain, by John 

 Frost, F. A. S. and L.S., of Emmanuel College, Cambridge, &c. Dedicated, by per- 

 mission, to the King. 



Malaria : an Essay on the Production and Propagation of this Poison, and on the 

 Nature and LocaUties of the Places by which it is produced j with an Enumeration 

 of the Diseases caused by it, and of the Means of preventing or diminishing them, 

 both at Home and in the Naval and Military Service. From the pen of Dr. Mac 

 Culloch. 



