CONTENTS of N° 22.— New Series. 



XLII. On the Method employed in the Trigonometrical Survey 

 for finding the Length of a Degree perpendicular to tnV Meridian. 

 By J. Ivory, Esq. M.A. F.R.S page 241 



XLIII. Some Remarks on an Article in the Bulletin des Sciences 

 Maihematiques Physiques et Chimiques, for March 1828. By 

 J. Ivory, Esq. A.M. F.R.S. &c • 245 



XLIV. On the Construction and Arrangement of the New Berlin 

 Astronomical Ephemeris. By Professor Engke 248 



XLV. On an improved Syphon-Hydrometer. By Mr. Henry 

 Meikle 258 



XL VI. A new Account of the Genus Echeveria. By. A. H. Ha- 

 worth, Esq. F.L.S. &c. &c 261 



XL VII. An Account of the Formation of Alcoates, Definite Com- 

 pounds of Salts and Alcohol analogous to the Hydrates. By Thomas 

 Graham, Esq. M.A. F.R.S. E.&c. (To be continued.) 265 



XL VIII. Remarks on the Influence of Terrestrial Radiation in 

 determining the Site of Malaria. By Wm. Addison. (To be con- 

 tinued.) 272 



XLIX. An Abstract of the Characters of Ochsenheimer s Genera 

 of the Lepidoptera of Europe; with a List of the Species of each 

 Genus, and Reference to one or more of their respective Icones. 

 By J. G. Children, F.R.S. L. & E. F.L.S. &c. (To be continued.) 278 



L. On the Crystalline Forms and Composition of the Sulphates of 

 Nickel. By R. Phillips, F.R.S. &c 287 



LI. Chemical Examination of some of the Substances connected 

 with an Egyptian Mummy. By E. S. George, F.L.S. Secretary to 

 the Leeds Philosophical and Literary Society 290 



LII. Proceedings of Learned Societies;— Geological Society; As- 

 tronomical Society ; Royal Academy of Sciences at Paris . . 294—306 



XLI. Intelligence and Miscellaneous Articles :— Chlorine in black 

 Oxide of Manganese ; Brown Oxide of Chromium ; Masses of Na- 

 tive Platina; Preparation of Titanic Acid; Artificial Formation of 

 Urea, by M. F. Wohler; Native Iron in the United States; Fossil 

 Reptiles ; Method of Preserving Funguses ; Difference of Longitude 

 between Paris and Greenwich ; Figure of the Cells of the Honey- 

 comb ; On Varignon's Method of Solving Equations of the Second 

 Degree, by M. Fayolle ; Mineralogical Literature ; Scientific Books; 

 New Patents; Meteor; Aurora Borealis? Solar Spots; Meteoro- 

 logical Observations ; Table, &c 306 — 320 



* * It is requested that all Communications for this Work may be addressed, 

 post paid, to the Care of Mr. R. Taylor, Printer, Red- Lion-Court, Fleet- 

 Street, London. 



