EDITORIAL NOTES. 



THE Magnetical and Meteorological results which form the greater part of 

 this volume are accompanied by Memoranda by Sir Frederick Evans, R.N., 

 K.C.B., F.R.S., and Staff-Commander Tizard, R.N., which fully explain the 

 origin and scope of these valuable contributions to science. 



The Challenger having traversed much of the navigable surface of 

 the globe during her voyage, it may be fairly assumed that these Magnetical 

 and Meteorological observations, from their extent and fulness, the excellence 

 of the instruments employed, and the careful manner with which they were 

 made, are of exceptional interest and value. 



The Meteorological Observations were taken by the Naval Scientific 

 Staff on board, under the direction of Staff-Commander Tizard, and reduced 

 and tabulated by him ; the extensive series of observations of the magnetic 

 inclination and intensity, made both on land and at sea by Commander 

 Maclear, R.N., and Lieutenant Bromley, R.N., were reduced by those officers, 

 and prepared for publication by Staff-Commander Creak, R.N., under the 

 superintendence of Captain Evans, R.N., C.B., F.R.S., Hydrographer of the 

 Admiralty. 



Appendix A. consists of a paper on the Pressure Errors of the Challenger 

 Thermometers, by Professor P. G. Tait. 



This is a most valuable contribution not only on account of its immediate 

 bearing on our deep-sea temperature observations, but also on account of the 

 many interesting facts, made known for the first time, with respect to the 

 behaviour of several substances under great pressure. 



