218 



PLANKTON OF WISCONSIN LAKES 



Table 51. Results of analyses of marine and fresh-water organisms 

 as given by other investigators. The sources of the data are indicated 

 in the first column of the table. The results are stated in percentages 

 of the dry weight of the material. All of the samples taken from 

 Brandt, except one, consisted of marine organisms; the series num- 

 bered II to X were catches of marine net plankton and contained vari- 

 ous kinds of organisms. Brandt considered the amount of nitrogen in 

 protein as 15.61 per cent and this gave him a protein factor of approxi- 

 mately 6.41 instead of 6.25; his data for crude protein, therefore, are 

 somewhat higher than those given in this table. 



The other samples shown in table 51, as well as one of Brandt's, con- 

 sisted of freshwater forms. Volk gives no data for nitrogen in the two 

 analyses recorded by him; instead of protein he designates this material 

 as "muscle and other tissue." Apparently he determined the ether 

 extract, crude fiber, and ash, and listed the remainder as "muscle and 

 other tissue." The latter, therefore, includes the crude protein and 

 the nitrogen free extract; an asterisk has been used in the table to call 

 attention to this fact. 







Nitro- 



Crude 



Ether 



Crude 







Authority 



Organism 



gen 



Protein 



(NX6.25) 



Ex- 

 tract 



Fiber 



Ash 



Silica 



Whipple and 



Microcystis 















Jackson 1 



(Clathrocystis) 



8.30 



51.87 













Anabaena 



9.60 



60.00 













Asterionella 

 Spirogyra 

 Oscillatoria, young 

 Oscillatoria, fully grown 

 Oscillatoria 



2.20 

 4.50 



13.75 

 28.12 







57.52 



49.48 











Hyams and 

 Richards 2 



9.00 



56.25 







4.50 



1.46 



7.90 



49.38 







6.40 



2.90 



Turner 3 



8.19 



51.19 



2.43 





7.09 





Brandt 4 



Peridinians (Chiefly 

















Ceratium) 



2.03 



12.68 



1.30 



41.50 



5.20 







Diatoms (Chiefly 

















Chaetoceros) 



1.56 



9.75 



2.80 





65.20 



54.50 





Freshwater Copepoda 



9.16 



57.25 



6.01 



4.54 



9.21 







Marine Copepoda 



9.18 



57.37 



7.40 





10.92 







Marine net plankton 

















II 



3.41 



20.06 



2.12 





9.94 



4.95 





III 



3.16 



19.75 



2.26 





8.55 



4.59 





IV 



3.28 



20.50 



3.21 





15.71 



9.59 





V 



3.14 



19.62 



4.31 





29.68 



16.33 





VI 



1.80 



11.25 



2.21 





60.08 



47.16 





VII 



2.43 



15.18 



4.24 





61.41 



51.26 





VIII 



5.61 



35.06 



1.56 





38.77 



27.00 





IX 



5.24 



32.75 



8.72 





19.41 



10.95 





X 



3.19 



19.94 



3.08 





36.14 



26.40 



Volk 5 



Eurytemora 





78.47* 



6.20 



11.07 



4.24 







Bosmina 





77.82* 



10.66 



8.21 



3.30 





1. Jour. N. E. Waterworks Assoc, Vol. 14, 1899, pp. 17-18. 



2. Technology Quarterly, Vol. 17, 1904, p. 275. 



3. Jour. Amer. Chem. Soc, Vol. 38, 1916, p. 1402. 



4. Wissensch. Meeresuntersuch., Abt. Kiel, N. F., Bd. 3, 1898, pp. 45-90. 



5. Verhand. d. Naturwis. Vereins in Hamburg, 3 Folge, XV, 1907, p. 45. 



