DEEP SEA SOUNDINGS. 
179 
happy undisturbed repose, but when roused by cruel 
treatment they are ever ready to exert all their 
maternal instinct in defence of their offspring. It is 
during these seven days we devote ourselves to a 
scientific examination of deep-sea temperatures in the 
Arctic seas. An account of our operations is deserv¬ 
ing of a chapter on that special subject. 
