THE VOYAGE OF THE CHALLENGEE. 45 



HookrS'fb/''"^*'.''''' ^' published. From the address of Sir Joseph 

 See etv ni,^^ +h5 ^ Tf as"i-y 111 communication with the Council of the 



entirely co^mpetent aTd rmn^wo^kerTil mo' ofJh^f.f'T'' f^'']''.'' 



The pnmary object of the expedition was, as our readers srP nmnv« +^ 

 explore the conditions of the deep sea and \hl l^I^T .Y^"^^' *^ 



From the time when the " Challenppr " 1pf+ qi^^^,.,,^ t^ 



7th, 1872, to her arrival at Spithead of 24th Ly m^^ December 



distance of 68,890 nautical miles, and at rnterSbo^it 19 f *™^'"^^ 

 362 observing stations, of which nearly Srjernnil A ^1^?' ^^^"^ 

 estabhshed. The observations made VeacW Lsewtre as' VJ"^ 

 circumstances would admit, the foUowine after th!f To Z- ^\.^^ 



en ?4;^:,eraUt„rz ss. %aTof oris-r S'','' r 



recall the discussions which have taken place as to Al' 1°"^*' 

 portion of sea-bottom covered with whaUs knowii «. -t^ 1 • "•" °* *^^ 

 or "modern chalk," which consistrusually of^ creanfy 'sSSe'r^''' 

 made up of little else than the shells most of tbeT^L + t^^^'"' 



of finely divided matter, consisting chiefly of coccoliths ami /of., i rJ ""^ 

 and a still smaller proportion of the spines and tpifnf ? r f''^'^''^'^^^' 



