RAPPORT 1905—06 ANNEXE € aies 
tongue of heavy water; accompanied by a draught to the NE., which probably 
ceases, or turns, in mid-sea (long. 3°) about midsummer, and on the W. Friesland 
coast in August. 
The results do not appear discordant with those of Roosenpaar and Win 
(Publications de Circonstance No. 26) and Everpincen and Winn (Ibid. No. 14). So 
far I have not proved a southerly current in summer, otherwise a comparison of 
the results with the charts of plaice-migration shows close agreement with the 
suggested view that they migrate against the current; a hyppothesis possibly corro- 
borated by their assortment into sizes. 
There is evidence that the course of the drifters is by no means rectilinear, 
and it is presumably cycloidal; the motion being resultant from steady drift, and 
far more rapid tides. 
GRAM 
a a 
