left alive, if the growth of the
ova in the ovaries is uniform--I mean if the growth of the ova is
as great in one month as another--because in May and June the ova
in a female Salmon is four times as large as these were in
November.

Again, when the gas tank at Settle was emptied into the Ribble, in
September, 1861, all the fish so far as was known were killed
between that place and Mitton, Salmon as well as Par and Trout.
Supposing that Salmon spawn every year, and that the Smolts come
up the river, as Grilse in the summer of the same year in which
they have gone to the sea in the spring, there ought to have been
a great scarcity of both Grilse and Salmon in the Ribble in the
year 1862, but so far was this from being the case, that both
Grilse and Salmon were more abundant that season than they had
been for some years previously, but there was a scarcity of both
in 1863.

Again, when the Smolts were turned out of the breeding ponds at
Dohulla, Galway, the experiment was looked upon as a failure
because no Grilse returned the same season, not one having showed
itself, but many came the summer after, proving pretty conclusively
that in some rivers, at all events, the Smolt requires a year's
residence in the sea before it returns as Grilse.

[3] In the evidence of Mr. George Hogarth, it is stated that he
saw upwards of ninety Kelt fish in the mill lead at Grandholme, on
the Don, May 6th.

[4] Salmon are said to produce 18,000 or 20,000 eggs each, and I
have no doubt that a large Salmon will produce more, as one I
examined a year or two ago, of about ten pounds weight, had a roe
which weighed two pounds nine ounces, and the skin in which the
eggs were enveloped (they were not in the loose state in which
they are found just before exclusion) weighed three ounces, after
all the eggs were washed from it; so that there were thirty-eight
ounces of eggs. I weighed fifty of them, and found they weighed
sixty-five grains. At that rate, thirty-eight ounces would give
12,788, and 300 lbs. 1,615,000; but as they would be much lighter
when dried and potted than when taken from the belly of the fish,
we may safely estimate that the 300 lbs. would contain 2,000,000,
a prodigious number to pass through the hands of one tackle maker
in a season.

[5] From "Loudon's Magazine of Natural History."

[6] I have frequently found, when catching Trout for this purpose,
that the milt and roe were not ready for exclusion; when this was