I'he deposit-samples and rock specimens brought home 

 by the "Michael Sars" were received in the Chal- 

 lenger Office shortly after the return of the expedition, 

 and upon examination the rock specimens proved to be 

 so numerous and to offer so many points of interest that 

 Dr. B. N. Peach, F. R. S., was requested to report upon 

 them. A brief note on his results appeared in "The 

 Depths of the Ocean" (London, Macmillan, 1912), pp. 202 

 —209, and his detailed report was published in the 

 Proc. Roy. Soc. Edin., vol. XXXll., pp. 262—291, 1912. 



When I met Dr. Hjort in London in May 1914 he 

 desired me to prepare, for publication in the series of 

 Reports on the scientific Results of the "Michael Sars" 

 North Atlantic Expedition, descriptions of the deposit- 

 samples, ' including for each station a brief summary of 

 Dr. Peach's observations on the rock-specimens obtained. 

 The accompanying Report shows that the "Michael Sars" 

 expedition has made a notable contribution to our know- 

 ledge regarding the materials covering the floor of the 

 North Atlantic Ocean. 



