Methods in Plankton Investigations. 



23 



Rafter, G. W. 

 '92. The Microscopical Examination of Potable Water. No. 103, 

 Van Nostrand's Science Series. 160 pp., 5 Pis., New York. 

 Reighard, J. E. 

 '94. A Biological Examination of Lake St. Clair. Bull. Mich. 

 Fish Comm. No. 4. 60 pp., 2 Pis., and map. 

 Ward, H. B. 



'96. A New Method for the Quantitative Determination of Plank- 

 ton Hauls. Proc. Am. Micr. Soc, Vol. XVII., pp. 255-260. 

 '96a. A Biological Examination of Lake Michigan in the Traverse 

 Bay Region. Bull. Mich. Fish Comm., No. 6. 100 pp., 5 Pis. 

 Zacharias, O. 



'93-'96. Forschungsberichte aus der Biologischen Station zu Plon, 



Theil I.-IV. Berlin. 

 '95. Ueber die Wechselnde Quantitat des Planktons im Crossen 

 Planer See. Forschungsberichte a. d. Biol. Station zu. Plon, Theil 

 III., pp. 97-117. 



♦EXPLANATION OF PLATES. 



Plate I. 



Fig. 1. Longitudinal section of plankton net. X L j. 

 c.b.l. Cone of butchers* linen, s.l. Stay-line. 



Fig. 2. 



Fig. 8. 



*Plates I., II., III., and IV. were drawn by C. A. Kofoid and inked by Miss L. M. Hart. 



