PROCEEDINGS FOR 1901 XXXI 
ences. To check the accuracy of the method, a trial month was calcu- 
lated in the year 1900; and on comparison with the observed tides, was 
found to be very satisfactory. 
With tide tables for Father Point, the tidal differences for the St. 
Lawrence can with advantage be divided into two series:—(1) For the 
time of the tide from the Traverse to Quebec, and above Quebec to Three 
Rivers, corrected tidal differences will be published with the Quebec tide 
tables. (2) The tide at places throughout the more open estuary below 
the Traverse, will be referred to Father Point; and with these will be 
included Anticosti and Chaleurs Bay; as the observations secured there 
have made it evident that these regions can also best be referred to 
Father Point. 
In order to make the information on the currents immediately 
available, a table giving the time of the turn of the current was issued 
in April as a “ Notice to Mariners.” 
The tide-levels, which have to be worked out in the reduction of the 
observations, will also be of practical service. These levels have been 
referred to the original Admiralty bench marks; the positions of those 
on the Lower St. Lawrence being kindly furnished by the Hydro- 
grapher to the Admiralty. The primary importance of these bench 
marks is very evident; as the low water datum of the charts is thus per- 
manently recorded. The points at which the bench marks have thus 
been made use of, are at Quebec, Grosse Isle, L’Islet, Orignaux Point, 
and Riviere du Loup; as well as the Tidal Survey bench mark at Father 
Point. 
The tide tables now issued are published in three sets as follows :— 
1. For Quebec, Halifax, and St. John, N.B., with tidal differences 
for the adjoining regions, and also for the Bay of Fundy, based upon 
recent observations there. Also for Father Point, accompanied by tidal 
differences for the regions that can be referred to it, as explained; and 
for Ste. Croix Bar between Quebee and Montreal. 
2. For Charlottetown, Pictou and St. Paul Island; with tidal 
differences for Northumberland Strait and the south-western shore of 
the Gulf of St. Lawrence. 
3. For Victoria and the Strait of Georgia, B.C.; with differences in 
time for Vancouver, New Westminster, Nanaimo, and Comox. 
It is proposed in the coming season to secure additional data in 
Northumberland Strait and Cabot Strait. This information will serve 
to give a better basis for the calculation of the tide tables. 
