560 Prof. G. H. Darwin. 



At Kingua-Fjord, the head of the expedition, Dr. Giese, charged 

 M. Miihleisen with the duty of making the observations. The 

 observations began on 22nd July at 6 A.M., and continued until 1st 

 September, 8 P.M., a period of 41 days. The height of water was 

 observed every two hours, and also every five minutes about high and 

 low water. From these observations a continuous tide- curve was 

 formed which was treated by harmonic analysis. 



Dr. Borgen informs me that the values of K for the diurnal tides 

 K 1? 0, P, as printed in his paper, require correction by 180. This 

 arose from the fact that the observations, as subjected to reduction, 

 began at midnight. The correction has been made in the table below. 

 The heights are given in metres by Dr. Borgen, but have been reduced 

 to feet. 



Kerguelen Island. 



These results are from a letter of Dr. Borgen to me, dated July 22, 

 1887. He writes : 



"I have just finished the calculation of the tides at Kerguelen 

 Island, Betsy Cove, where we had a self -registering tide-gauge put 

 up by the officers of H.M.S. " Gazelle," when there for the purpose 

 of observing the transit of Venus in 1874. The observations com- 

 mence at noon November 16, 1874, and close at noon January 29, 

 1875. Some difficulties, which arose from choking up and partially 

 destroying the pipe in which the float moved, caused two inter- 

 ruptions of five and nine days. From this cause, and because the 

 weather in that region is rather boisterous (we noticed 450 hours out 

 of a quarter of a year, or 2,160 hours, with a velocity of the wind 

 higher than 15 metres per second), I am inclined to think the 

 constants are not quite so satisfactory as they would have been in a 

 calmer ocean." 



The results have been reduced from centimetres to feet. 



The Hudson Straits Stations. 



The observations at these stations were taken under the super- 

 vision of Lieutenant Gordon, R.N". The length of observation at 

 each station was short, and the results must be correspondingly 

 uncertain. The dates at which the observations began are entered in 

 the table below, together with the periods. 



The obsei vations at Port Burwell were taken every two hours, and 

 at all the other stations, besides the bi-hourly measures, observations 

 were taken at intervals of five minutes about the tim.es of high and 

 low water. The reductions were made by Lieutenant Gordon, with 

 the assistance of Professor Carpmael, of Toronto. 



During the observations at Ashe Inlet, and at Stupart's Bay, the 

 Straits were choked with ice, and this may have exercised some 

 influence on the tides. 



