TO CORRESPONDENTS, 



Mr. RiDDtE's Letter, and Mr. D. Mushet on the Origin and Discovery of Iron, 

 in our next. 



Mr. Saml-ei. Ta-vi-or's Communication on the Causes of a singular partial 

 Failure in the Growth of Turnips, is received. We have also to thank him for 

 Obser\ations on the French Report on the early Cutting of Wheat in our present 

 Number. 



We have not room to continue the Phrenological Controversy. 



The great number of characters which typography does not furnish has been 

 the obstacle to our hitherto availing ourselves of Mr. Upington's continuation. 



Mr. P. Nicholson on Equations, Di*. De Sanctis's Experiments, Mr. Gut- 

 TERiDGE on Weights and Measures, Mr. R. H. Goaver's Description of a Life 

 Boat, and Mr. Meikle on the Lunar Distance, will appear as soon as possible. 



We shou^d have been happy had our limits allowed us fully to comply with the 

 wish of our Correspondent J. M. We have endeavoured in our present Number, 

 page 147, to meet his wishes in part. 



Our thanks are due to our respected friend Mr. De Nelis, of Mechlin, for 

 the Account of his Experiments, and those of MM. Becquet de Megille and 

 Stoffels. - - " 



Published by the Authority and at the Expense of the Board of 

 Longitude. 8vo. Price 10s. 



TABLES to be used with the NAUTICAL ALMANAC, for 

 finding the LATITUDE and LONGITUDE at SEA. 



By the Rev. W. LAX, M.A. F.R.S. 

 Lowndes* Professor of Astronomy and Geometry in the University of 



Cambridge. 

 Containing a complete and compendious Set o( Tables, In which the 

 quantities are taken out by immediate inspection, and the proportional 

 parts are additive ; with easy and accurate methods of solving the various 

 Problems required, and the newest determinations of the Latitudes and 

 Longitudes of places: intended as a Substitute for the Requisite Tabjes. 



Sold by John Murray, Publisher to the Board of Longitude, Albemarle- 

 slreet. 



Published by the Authority, and at the Expense of the Board of 

 Longitude. 4to. Price 31. 



TABLESof LOGARITHMS of all NUMBERS, from 1 to 101000, 

 and of the SINES and TANGENTS to every SECOND of the 

 QUADRANT. 



By MICHAEL TAYLOR, 



Autlior of the Sexagesimal Tables. 



With a Preface, and Precepts for the Explanation and Use of the same. 



By NEVIL MASlitLYNE, F.R.S. Astronom.pr Royal. 



Sold by J<5hn Murray, Publisher to the Board of Longitude, Albe- 

 mvle-street. 



