ong with the other? Yet no one
alleges that he has ever seen parr _as such_, making a journey towards
the sea "They cannot do so" says Mr Shaw, "because they have been
previously converted into smolts."

Mr Shaw's investigations were carried on for a series of years, both on
the fry as it existed naturally in the river, and on captive broods
produced from ova deposited by adult salmon, and conveyed to
ingeniously-constructed experimental ponds, in which the excluded young
were afterwards nourished till they threw off the livery of the parr,
and underwent their final conversion into smolts. When this latter
change took place, the migratory instinct became so strong that many of
them, after searching in vain to escape from their prison--the little
streamlet of the pond being barred by fine wire gratings--threw
themselves by a kind of parabolic somerset upon the bank and perished.
But, previous to this, he had repeatedly observed and recorded the
slowly progressive growth to which we have alluded. The value of the
parr, then, and the propriety of a judicious application of our
statutory regulations to the preservation of that small, and, as
hitherto supposed, insignificant fish, will be obvious without further
comment.[16]

[16] Mr Shaw's researches include some curious physiological
and other details, for an exposition of which our pages are not
appropriate. But we shall here give the titles of his former
papers. "An account of some Experiments and Observations on the
Parr, and on the Ova of the Salmon, proving the Parr to be the
Young of the Salmon."--_Edinburgh New Phil. Journ_. vol. xxi.
p. 99. "Experiments on the Development and Growth of the Fry of
the Salmon, from the Exclusion of the Ovum to the Age of Six
Months."--_Ibid_. vol. xxiv. p. 165. "Account of Experimental
Observations on the Development and Growth of Salmon Fry, from
the Exclusion of the Ova to the Age of Two
Years."--_Transactions of the Royal Society of Edinburgh_, vol.
xiv. part ii. (1840.) The reader will find an abstract of these
discoveries in the No. of this Magazine for April 1840.

Having now exhibited the progress of the salmon fry from the ovum to the
smolt, our next step shall be to show the connexion of the latter with
the grilse. As no experimental observations regarding the future
dimensions of the _detenus_ of the ponds could be regarded as legitimate
in relation to the usual in