1915] Michael, ct al. : Hijdrographic Records of Scripps Institution 43 



tent and depend upon the assumption that the water of this region 

 is ahva.ys identical in composition to the "normal sea-water." 



2. In hydrodvnamic investigations, especially relative to convective 

 circulation, a knowledge of the densities in situ is essential and, of 

 course, depends directly upon specific gravity. 



E. LITERATURE CITED 



BjERRUM, N. 



1904. On the determination of chlorine in sea-water and examination of 



the accuracy with which Knudsen 's pipette measures a volume of 

 sea-water. Medd. Komm. Havundersbgelser (Hydrografi) 1 No 

 3, 11 pp. < ' ■ 



Dickson, H. N. 



1901. The circulation of the surface waters of the North Atlantic Ocean. 

 Phil. Trans. E. Soc. London (A), 196, 61-203, pis. 1-4. 

 Ekman, V. W. 



1905a. On the use of insulated water bottles and reversing thermometers. 



Cons, perman. Explor. Mer. Publ. Circ, 23, 28 pp.. 2 pis. 

 1905b. Kurze Beschreibung eines Propell-Strommessers. Ibid., 24, 4 pp., 1 pi. 

 Fox, C. J. J. 



1905. On the determination of the atmospheric gases dissolved in sea- 



water. Ibid., 21, 24 pp., 1 pi., 4 figs, in text. 

 Helland-Hansen, B. 



1911-12. The ocean waters, an introduction to physical oceanography. 

 1. General part (methods). Intern. Rev. ges. Hydrobiol. Hydrog., 

 3, Hydrog. Suppl., pp. 1-84, figs. 1-46 in text. 

 Herdman, W. A., Scott, A., and Dakin, W. J. 



1910. An intensive study of the marine plankton around the south end of 

 the Isle of Man, Part 3. Proc. Trans. Liverpool Biol Soc., 24, 255- 

 359, pis. A-B, figs. 1-21 in text. 

 HOM^N, T. 



1907. Hydrographische Untersucuungen im nordlichen Telle der Ostsee, im 

 Bottnischen und im Finnischen Meerbusen, 1898-1904. Findland- 

 ische Hydrog. Biol. Unters., 1, 46-|-144 pp., 2 pis. 

 Knudsen, M. 



1901. Hydrographische Tabelleu (Copenhagen, Gad), v-f63 pp. 

 KoFom, C. A. 



1905. A self-closing water bucket for plankton investigations. Cons. 



perman. Explor. Mer. Publ. Circ, 32, 10 pp., 4 figs, in text. 

 1911a. On a self-closing plankton net for horizontal towing. Univ. Calif. 

 Publ. Zool., 8, 311-348, pis. 22-25; also in Intern. Rev. ges. 

 Hydrobiol. Hydrog., 5, 91-92, pi. 11. 

 1911b. On an improved form of self-closing water-bucket for plankton in- 

 vestigations. Univ. Calif. Publ. Zool., 8, 349-352, figs. A-C in 

 text. 



