CONTENTS. 



PAGE 



I. MEMORANDUM ON THE MAGNETICAL OBSERVATIONS MADE DURING THE VOYAGE. By Sir FREDERICK 



EVANS, KC.B., F.R.S., Hydrographer, ... . 1 



II. MAGNETICAL INSTRUCTIONS, 1872, ........ 8 



Addenda to Magnetics! Instructions of 1872, . . . . . 21 



NOTE. This Volume would, according to the original plan of publication, 

 have been issued with the first Volume of the Report, which will contain 

 the General Narrative of the Voyage. 



The completion of the Narrative having been delayed in consequence of 

 the illness and death of the first Editor, it has been judged better not to 

 postpone the publication of the scientific results contained in Volume II., 

 which he had more nearly completed. 



H. M. STATIONERY OFFICE, 

 July 1882. 



7. Abstract of constants of the Ship's Magnetic Force, ..... 298 







TIL MEMORANDUM ON THE METEOROLOGICAL OBSERVATIONS MADE DURING THE VOYAGE. By Statf- 



Commander TIZARD, R.X., ........ 300 



VIIL ABSTRACT OF METEOROLOGICAL OBSERVATIONS, ....... 305 



Appendix A. THE PRESSURE ERRORS OF THE CHALLENGER THERMOMETERS. 



By Professor P. G. TATT, M.A., Sec. E.S.E., Professor of Xatural Philosophy in the University of Edinburgh. 



Received 1st July 1881. 



Appendix B. ON THE PETROLOGY OF ST. PAUL'S ROCKS (Atlantic). 



By Professor A. EENARD, F.G.S. 



Received 30th October 1879. 



