he short
period of four or five months into beautiful full-formed salmon, ranging
from 9 lb. to 14 lb. in weight, the difference still depending on the
length of their sojourn in the sea."

In January 1842, he repeated the same process of marking 4 lb. grilse
which had spawned, and were therefore about to seek the sea; but,
instead of placing the wire in the back fin, he this year fixed it in
the upper lobe of the tail, or caudal fin. On their return from the sea,
he caught many of these quondam grilse converted into salmon as before.
The following lists will serve to illustrate the rate of growth:--

_List of Grilse marked after having spawned, and re-captured as Salmon,
on their second ascent from the Sea._

Period of Period of Weight when Weight when
marking. recapture. marked. retaken.

1841. Feb. 18. 1841. June 23. 4 lbs. 9 lbs.
... 18. ... 23. 4 lbs. 11 lbs.
... 18. ... 25. 4 lbs. 9 lbs.
... 18. ... 25. 4 lbs. 10 lbs.
... 18. July 27. 4 lbs. 13 lbs.
... 18. ... 28. 4 lbs. 10 lbs.
March 4. July 1. 4 lbs. 12 lbs.
... 4. ... 1. 4 lbs. 14 lbs.
... 4. ... 27. 4 lbs. 12 lbs.

1842. Jan. 29. 1842. July 4. 4 lbs. 8 lbs.[20]
... 29. ... 14. 4 lbs. 9 lbs.[20]
... 29. ... 14. 4 lbs. 8 lbs.
March 8. ... 23. 4 lbs. 9 lbs.
Jan. 29. ... 29. 4 lbs. 11 lbs.
March 8. Aug. 4. 4 lbs. 10 lbs.
Jan. 29. ... 11. 4 lbs. 12 lbs.

During both these seasons, Mr Young informs us, he caught far more
marked grilse returning with the form and attributes of perfect salmon,
than are recorded in the preceding lists. "In many specimens the wires
had been torn from the fins, either by the action of the nets or other
casualties; and, although I could myself recognise distinctly that they
were the fish I had marked, I kept no note of them. All those recorded
in my lists returned and were captured with the twisted wires complete,
the same as the specimens transmitted for your examination."

[20] These two specimens, with their wire marks _in situ_, may
now be se