TO CORRESPONDENTS. 



We have to acknowledge the receipt of the following Communications 

 all wh.ch will n:eet with the earliest attention :_Mr. Watkrstone on a 

 New Dynamico-Chemical Principle , Mr. B.^ckwax^.'s Examination of 

 M. ViuEVs Observations on Aeronautic Spiders; Mr. Nixon on the 

 Honzon-Secror ; and Mr. Brooke's Mineralogical Notices. 



D. T. will receive a private communication : his Notice on the Flight 

 of Insects will be inserted in our next. 



Young's Elements of the Differential Calculus ; Part I. of the Transac 

 fonsofthe Natural History Society of Newcastle-upon-Tyne; and Mr 

 Rekkic-s Edition of Montagu's Ornithological Dictionary, have been 

 receded for Review. The latter work will be reviewed in our next 



* The EdUors request that all Communications intended for immediate 

 rnsert^n may be sent to the care of Mr. Richard Taylor, PrintinToZ 

 RedUon Court, Fleet Street, London, at farthest by the Uth da", Tthe 

 '"O"^^' or they^UUe too late to ar^earinZ ensuing NumZ ' '^ 



