SUEFACE WATEES OF THE NOETH ATLANTIC OCEAN. 
115 
7. Report by Pettersson, O., 1892. 
8. Report upon a Physical Investigation of the Waters off the Southern Coast of 
New England. Bulletin of the U.S. Fish Commission for 1889. 
Washington, 1891. 
9. Trans. R.S.E., and Scottish Geographical Magazine, various years. 
10. Grundragen af Skageracks och Kattegats Hydrografi. Stockholm, 1891. 
11. Scottish Geographical Magazine, 1894 ; also Pettersson and Ekman, Ytvatt- 
nets Tillstand i Nordsjon och Skagerack. Stockholm, 1895. 
12. Ryder and Rordam. Hydi’ografiske Undersogelser. Copenhagen, 1895. 
13. Report, vol. 1, Part I. Hydrography, by M. Knudsen. Copenhagen, 1899. 
14. Aarbog. Also Carl Ryder. Isforholdene i Nordhavet. Copenhagen, 1896. 
15. Hydrographic-biological Studies of the Norwegian Fisheries. Christiania, 1896 ; 
also Naturen, Bergen, June, 1897, and Naturwissenschaftliche Wo- 
chenschrift, 1897, p. 518. 
16. Fifteenth Report of the Fishery Board for Scotland, Part HI., jj. 280. 
17. See Schott, G., Archiv der Deutschen Seewarte, 1898 ; also Nature, vol. 59, 
p. 539. 
18. Scottish Geographical Magazine, 1894, p. 286. 
19. Revue Scientifique, 1897, p. 584 ; also Report of the “ Ingolf” Expedition. 
20. Cleye, P. T. a Treatise on the Phytoplankton of the Atlantic and its Tribu¬ 
taries. Upsala, 1897. The sudden changes observed in the nature 
and quantity of Plankton make it difficult to place much confidence in 
conclusions arrived at in this way as to circulation. It seems necessary 
to ascertain first, by strictly simultaneous observations spread over 
a considerable area, whether these changes are, or are not, merely 
local. 
21. See Pettersson, Ueber die Beziehungen zwischen hydrographischen und meteoro- 
logischen Phanomenen. Meteorologische Zeitschrift, August, 1896. 
22. Twelfth Report of the Fishery Board for Scotland, Part III., p. 336. 
23. Geograjffiical Journal, March, 1896. 
24. See Note 21 ; also Geograpliical Journal, June, 1898, p. 609. 
25. Ueber einige meteorologische Beziehungen zwischen dem Nordatlantischen Ozean 
und Europa im Winterhalbjahr. Meteorologische Zeitscluift, 1898, 
p. 85 ; also Der Zusammenhang des Winterklimas in Mittel- und Nord- 
v^est-Europa mlt dem Golfstrom. Zeitschrift der Gesellschaft fur 
Erdkunde, 1898, p. 183. 
26. “ Ingolf” Expedition. Hydrography, p. 28. 
27. Annalen der Hydrogra 2 :)hie, August, 1898 ; also Geographical Journal, August, 
1899, p. 185. 
28. The Laboratory Numbers of these samples (Table I.) are given in Appendix III. 
Q 2 
