^{page 374 note *} Where only the cartilaginous portion of the fins is taken off, they frequently prove defective marks, as nature always makes an effort to heal and restore those important organs of locomotion, when injured. But when taken off close to where they articulate with the body, the parts are never restored. See, as examples, the dorsal and anal fins of No. 11.

^{page 375 note *} Among innumerable authentic and well-known instances of the migratory Salmonidæ returning to their own rivers, I may state, that, of the many hundreds of this species which I have marked, I am not aware that even one of them has ever found its way into any of the tributaries of the Solway, saving that of the river Nith.

I may here note, in reference to the change of colour in fishes in relation to the bed on which they rest, that if the head alone is placed upon a peculiar shade, whether light or dark, the whole body of the fish will immediately assume a corresponding shade, entirely independent of the colour of the ground on which the body itself may happen to rest.