342 American Fisheries Society 



parts of the deeper stations. The water samples were titrated 

 and the salinities and densities found by Dr. Alexander 

 Vachon, of Laval University. From the data thus obtained, 

 isotherms, isohalsines and isosteres have been constructed. The 

 form and distribution of these surfaces show that the water 

 in the southwestern half of the Bay of Fundy throughout its 

 depth has during the summer period the cyclonic movement 

 shown by the current measurement and drift bottles to occur 

 at the surface. From the disposition of the surfaces of 

 equal density or, to be more exact, the surfaces of equal 

 specific volumes, called isosteres, the actual velocity of the 

 water between the stations and at right angles to the sections 

 can be calculated. This has been done, using the method of 

 Bjerkan, and the velocities found in this way for the super- 

 ficial water agree approximately in direction and magnitude 

 with the velocities determined from the current measurements 

 and drift bottles. 



All three methods of investigation agree in showing that 

 the water in the lower half of the Bay of Fundy is in cyclonic 

 circulation and the hydrographic sections show that this cir- 

 culation extends to the deeper layers. It is therefore prob- 

 able that almost all of the water in the lower half of the bay 

 is completely changed in a comparatively short time, less than 

 one year. The practical agreement of these three investiga- 

 tions justifies the method of each of them for the investigation 

 of the movements of the water in regions comparable to the 

 Bay of Fundy. 



Sixteen of the drift bottles set out in the Bay of Fundy 

 have been reported from the Gulf of Maine. An account of 

 the finding of these bottles has already been published by the 

 writer.* The following quotations are taken from that 

 account : 



The bottles were of two kinds ; two-ounce bottles and eight-ounce 

 bottles; to the latter a galvanized iron drag was attached to hang at a 

 depth of three fathoms, the object of the drag being to minimize the 



*Science, N. S. Vol. LII, No. 1349, pp. 442-443, November 5, 1919. 



