336 
THE VOYAGE OF H.M.S. CHALLENGER. 
ditions, accumulate and form a relatively larger proportion of the deposit than in other 
regions where the accumulation is more rapid, or where they are submitted to the wear 
and tear of mechanical forces. For all the reasons then that have been set forth in the 
preceding pages, we appear justified in regarding the small black shining spherules with 
metallic nuclei, as well as the chondritic spherules, discovered in deep-sea deposits as 
extra-terrestrial bodies allied to meteorites, and in all probability thrown off by them 
in their passage through the earth’s atmosphere. 
