2 Vniversitij of California I'ublicatioits in Zoology [Vol.15 



PAGE 



(e) The Kofoid water bottle 11 



(/") The Ekman reversing water bottles 12 



(g) A combination apparatus 13 



(ft) Other apparatus 13 



3. Collection of water samples and measurement of temperature 13 



(a) Surface samples 13 



(ft) Sub-surface samples 14 



4. Method of recording 17 



C. Errors in field observations 18 



1. Errors due to position 18 



(a) Latitude and longitude 18 



(6) Depth 20 



2. Errors due to apparatus 21 



(a) The Kofoid net 22 



(6) The Nansen nets 23 



(c) Preservation of water samples 25 



D. Analysis of sea-water 26 



1. General properties of sea-water and measurement of salinity 26 



(a) Composition of sea-water 26 



(6) Direct measurement of salinity 27 



(c) Methods of measurement in general use 28 



2. Methods of salinity determination employed by the Scripps 



Institution ^ 28 



(a) The pycnometer method 28 



(6) The hydrometer method 30 



(<■) Mohr's titrimetric method 32 



(d) The sinker method 32 



3. Comparison of our experience relative to accuracy and efficiency 



in water analysis with the experience of other investigators.... 37 



(a) Brief review of our own experience 37 



(b) The experience of others 38 



4. Reliability of the assumption of constant proportion of the salts 



in sea-water 41 



E. Literature cited 43 



Part II. Tabulation of data 45 



A. General explanation of tables 45 



B. Hydrographic data 48 



Table 1. Ocean data 48 



Table 2. Data relative to San Diego Bay 112 



Part A. Preliminary observations 112 



Part B. Special bay data 119 



Part C. Miscellaneous bay data 122 



Table 3. Gas content 125 



Table 4. Soundings 126 



C. Biological field data 133 



Table 5. Data relative to plankton hauls 133 



Part A. Preliminary plankton collections ; 133 



Part B. Plankton collections of quantitative significance 156 



Table 6. Data relative to dredge hauls 194 



Part A. Dredge hauls made during 1001 194 



Part B. Dredge hauls made subsequent to 1901 198 



