ig. 49. A flat-bottomed dredging boat rigged with two crowfoot 
dredges, with typical fisherman, McGregor, Iowa. Note the 
shore strewn with dead shells. This is an example of the 
waste of raw material which has now largely ceased follow- 
ing the educational movement inaugurated by the U. S. 
Bureau of Fisheries through the biological station at Fair- 
port, Iowa. Photograph by Frank M. Woodruff. 
Fig. 50. Summer Fleld Laboratory at the outlet near Brewerton. 
