350 APPENDIX. No. XIX. 



No. XIX. 



ABSTRACT OF RESULTS OBTAINED FROM THE 

 TIDAL OBSERVATIONS 



MADE Off BOARD H.M. SHIPS ' DISCOVERY' AND ' ALERT ' IN 1875-6. 



BY THE REV. SAMUEL HAUGHTON, M.D., D.C.L., F.R.S. 



Fellow of Trinity College, Dublin. 



THE tidal observations made during the recent Arctic Expe- 

 dition were of great value, and confirm the opinion, formed 

 on other grounds, that Greenland is an island. 



During seven months (twenty-eight days each) on board 

 the 'Discovery' at Bellot Harbour, lat. 81 45', long. 65 W., 

 hourly observations were made, broken by interpolations in 

 six days only. 



On board the ' Alert,' near Cape Sheridan, lat. 82 25', 

 long. 61 30' W., the difficulties of observation were greater, 

 owing to the more exposed position of the ship; notwithstand- 

 ing which, two months of hourly observations (with inter- 

 polations in fifteen days) were secured; and these hourly 

 observations were supplemented by valuable determinations 

 of the times of high and low water, and by four hourly ob- 

 servations made at other times. 



The expedition, proceeding northwards up Smith Sound, 



