CARPS. 
211 
were all taken from the same individual fish, and 
' their number might have been much increased. 
I The whole surface of each scale, when viewed 
under a lens of low power, is seen to be covered 
I with concentric lines, following the irregular 
I sinuosities of the outline. These lines are the 
i edges of the successive layers of which the scale 
I is believed to be composed, each layer being 
i added in the process of growth to the under 
SCALES OF GOLD FISH {magnified). 
surface, and each being a little larger every way 
than its predecessor ; thus the scale is a very de- 
pressed cone, of which the centre is the apex. 
( There is a marked difference (indicated in the 
figures) between that part of the surface which 
is exposed, and that which is covered by the 
, other scales ; the concentric marks in the former 
