PHYSICAL FEATURES OF THE IRISH SEA. if 
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LOCALITIES. he, Sey 22 As Bs Zee 
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ING WrECIODCOttcevscre-shstks<ceeruseesosvrereennacine 1:02476 | 1:02605 17°25 31°17 51°20 1646 
Piel (Barrow Channel) .............:000 1:02516 | 1:02647 17°88 32°30 53°66 1663 
Port Erin (High water after rain) ... ...| 1:02585 1-02719 18°23 32:94 54:97 1672 
Port Erin (Low water) .f..6......cc0eceenes ...| 1:02582 | 1:02716 18°28 33°03 53°02 1608 
Fleshwick (High water) ..... ...| 102594 | 1:02729 18°41 33°26 53°20 “1600 
Crosby Channel (1 hour flood) ...... .. | 1°02837 1°02459 16°56 29°92 55°50 1857 
1 mile N. of Bar Lightship (Low water) ...! 1°02527 | 1-02658 18°05 32°61 54:29 “1667 
BIZ CE OOM ces: evra asee eck ewvasee otanti eerie ass 1:02390 | 1:02514 1712 30°93 55°93 1778 
Landing Stage (High water) . ...| 1:02313 | 1:02433 16°60 29-99 51°74 1728 
Landing Stage (Low water)....... ...| 1°01631 1:01714 11°33 20°46 5111 2500 
45 miles S.E. of Douglas ....... ...| 102572 | 1:02713 18°50 33°42 55°57 1672 
30 miles S.E. of Douglas ..... ...| 1:02606 | 1:02741 18°54 33°49 54:00 1615 
15 miles S.E. of Douglas .. ...| 102601 1-02736 18°45 33°33 52°38 “1574 
Wourlasi(Low/ Waten)...csssere-sosceoseccesesecses 102572 | 1:02706 18°49 33°40 54:29 1628 
6.—TIpDES AND CURRENTS. 
In connection with the investigation of the surface life, in discussing the appearance 
and disappearance of swarms of certain Copepoda and Medusz, and in considering the 
possible influence of the movements of food matters upon the migration of fishes, we tried 
some years ago by means of small ‘‘drift bottles” to ascertain the set of the chief 
currents, tidal or otherwise, such as the movement of surface waters caused by prevalent 
winds. The Prince of Monaco started a few years before that the system of distributing over 
the North Atlantic large numbers of small floating copper vessels, with the object of 
finding out where they drifted to. This plan we have adopted, with slight modifications. 
In September, 1894, we selected a small, strong, buoyant bottle, measuring 7°5 cm. by 
1°8 cm., which seemed well suited for the purpose, and which costs only 7s. per gross. 
We afterwards adopted a rather larger size of bottle, 8°5 cm. in length, and substituted stamped 
and addressed postcards for the slips of paper, as getting rid of various postal difficulties 
that had occurred. I drew up a notice, as follows, to go in the bottles, and had a large 
number printed and numbered consecutively :— 
Notice—Anyone who finds this is earnestly requested to write the place, and date 
when found, in the space on the other side for the purpose, place the paper in an 
envelope, and post it to PRorEssor HEerRDMAN, University College, LivERPOOL. 
Postage need not be prepaid. 
INQ) pes: [Turn over. 
[OTHER SIDE. ] 
Please write distinctly and give full particulars. 
MOC AMT ACEC OUMG! foevlaw sion sieisan a= ss neuiscscrniseesecdee se eesoaseoranr merase cecencovencersirnes astees 
Date sv ene OUD screeiteescce soso cesses sein 
Name and address of sender........ ..... 0s cecseees 5 
A paper was then placed in each bottle, so folded that the number could be readily 
seen through the glass, the cork was well pressed down, and dipped in melted paraffin. 
Nearly two thousand of these bottles have, since that date, been dropped into the sea in 
various parts of our area, a record being kept of the locality and time when each was set 
