( 502 ) 
PLATE II 
Fig. 19. Part of a scale from the side of a so-called small summer salmon of 
84 cm, caught August 6th, 1909. Magnified 30 diameters. This salmon 
came into the sea after having spent over a year in freshwater and 
returned to the river after a stay in the sea of about 39 months. 
Fig. 19a. The same scale entirely. Magnified 4.2 diameters. 
Fig. 20. Part of a scale from the side of a so-called large summer salmon of 
102 cm., caught August 6th, 1909. Magnified 30 diameters. This salmon 
after having spent over a year in the freshwater descended to the sea 
and stayed there for about 51 months, perhaps broken by a visit to 
the river. 
Fig. 20a. The same scale entirely. Magnified 4.2 diameters. 
Fig. 21. Scale from the side of a young salmon of 20.4 cm., caught intheKinzig 
May 13th, 1909. Magnified 30 diameters. In this scale the formation of 
rings in the first months seems to have failed — probably the scale is 
a new product formed in the place of a scale which was lost. 
Fig. 22. Scale from the side of a brook-trout (,Salmo fario) of 17 cm, caught 
in the Hohlbach November 1909. Magnified 30 diameters. 
Fig. 23. Scale from the side of a sea-trout (Salmo trutta ) of about 45 cm, 
caught in the Baltic near Bornholm. Magnified 30 diameters. 
(January 12, 1910). 
