— 75 — COUNCIL^MARCH1920-APPENDIX 



(5) Fuller particulars of work on plaice eggs. 

 Southern Bight. 40 stations between Swarte Bank and Dover, all but 

 3 Haaks or southward. Chart will be produced. 



Flamborough Off. 33 stations between Shields and Swarte Bank, Eng- 

 lish Coast and Dogger. Chart will be produced. 



Estimating halt hour per station and 8 knots, each cruise is allowed 5 days. 

 Southern Bight. 5 days between December 15th and 31st. 

 5 — — January 1st and 15th. 

 5 — - — 15th and 81st. 



5 • — — February 1st and 15th. 

 Flamborough Off. 5 days between February 1st and 15th. 

 5 — — — 15th and 29th. 



5 — — March 1st and 15th. 

 At each station, 2 hauls with egg-net, also surface temperature and sample. 



(Signed) H. J. Buchanan Wollaston. 

 Mr. Wollaston agreed that certain stations out of those chosen should have 

 precedence in any case of difficulty in completing the work. 



(6) Fuller particulars of hydrographie work in connection with plaice. 

 (A). Drift Bottle Operations. 



(a) During spawning season from mid-December to end-April = 140 days, 

 from selected Lightships: 4200 surface and 4200 bottom drifters. 



(b) Throughout the year from Lightships at key positions. 4775 bottom 

 drifters and 9550 surface drifters = 14325 drifters. 



(c) Flamborough — Off Grounds. 



1,000 drifters, surface and bottom in equal numbers, during the spawning season. 



(B) Surface salinity and temperature. 



The Research Ship to take surface temperatures and water samples at 

 hourly intervals when at sea. 



Lines of surface samples across the North Sea will also be arranged on com- 

 mercial vessels as supplementary to the above. A number of Lightships will also 

 be engaged in surface sampling on both sides of the North Sea. 



(C) Sub-surface salinity and temperature. 



The Research Ship will examine the vertical distribution of sahnity and 

 temperature : ■ — • 



(a) at all Hensen net Stations. 



(b) at all Trawling Stations. 



(Signed) E. C Jee. 

 ■ 10* 



