Smithsorian Report. 1938. — Panning 



Plate 4 



Catching young mitten crabs wandering upstream into traps by the Havel dam in Gruetz (in Branden- 

 burg) during the summer of 193fi. (Photograph by Weltbild.) 



2. This large animal marked with white paint was turned loose in Garz on the Havel, recaptured near 

 Wittenberg on the Elbe; it traveled 123 km. in 12 days. 



