[w. BELL DAWSON] TIDES IN GULF AND RIVER ST. LAWRENCE 61 



atious were available ; but at St. Paul island the detei'ini nation is based 

 upon sets of four tides at 23 semi-lunations throughout the year 1896. 

 The results are as follows ; the corrected establishments being in 60th 

 meridian standard time : — 



Neguac. Establishment =ôh. 01m. Corrected establishmeut=5h. 20m. 



St. Paul island. Establishment=8h. 40m. Corrected estabUshment=8h. 41m. 



The latter result is within one minute of the value found for the 

 Establishment from the earlier observations of 1894, by the method given 

 in the "Annuaire du Bureau des Longitudes," and based upon eight 

 semi-lunations. 



The difference in the time of high water between Neguac and St. 

 Paul island, was then found from 102 tides as observed fi'om July to 

 November, 1896 ; the values given being the average of the three highest 

 and three lowest of the individual differences. The result is as follows : — 



Neguac and St. Paul island. Distance 250 miles. 

 DiflFerence in time of H. W. ranges from 2h. 10m. to 4h. 28m. 

 Range in the difference, 2h. 18m. Average=3h. 21m. earlier. 



The average is thus the same as the difference in the corrected estab- 

 lishment ; and this result must be accepted as the best that can be 

 obtained ; as the differences, if taken in the opposite sense (i. e. later than 

 at St. Paul island), are extremely ii'regular. 



Along the north shore of Prince Edwai-d Island, the bays are much 

 shut in by sand bars ; and as the object was to obtain comparisons for the 

 tide on the open coast, the tide gauges were placed as near as possible to 

 the mouth of the bays, where the tide would not be retarded locally. 

 The positions at which the gauges were placed were as follows : — Alber- 

 ton, at the Government wharf, beside the range-light mast, 1^ mile from 

 the mouth of the buy ; Rustico, at the breakwater at East Rustico beach ; 

 St. Peter's, at the lighthouse breakwater, at the entrance of the bay. 

 The observations at these stations were for so short a time, and the tides 

 are so flat, ihat a special method was employed to obtain the best 

 result : — 



Direct differences in the time of high water were taken in both direc- 

 tions, to Neguac on the one hand and to St. Paul island on the other ; 

 and by means of these differences, values for the Establishment were 

 found. The mean luni-tidal interval from all the observations obtained, 

 was taken as another value for the Establishment. The two values, as 

 thus found, differed only by 3"° to 13™ from each other ; and the average 

 of the two was adopted as the true value of the Establishment. The 

 differences in Establishment between these stations and St. Paul island 

 as thus found, were then taken as the correct difference in the time of 

 high water. By this method, all good observations could be utilized ; 

 which is important where the tides have so small a range that the time 



