long and stamped with a steel die. The fish marked were dis missed in
the month of November. Every time it was tried a considerable number of
them was caught the ensuing spring, but with no essential change in
their condition, indicating that they had not meanwhile visited their
spawning grounds. In no case was a specimen caught in improved
condition during the first season succeeding the marking.

But the following year, in May and June, a few of them were taken in
prime condition--none otherwise--and it several times occurred that
female salmon were a second time committed to the inclosure and yielded
a second litter of eggs. The growth of the salmon during their absence
had been very considerable, there being always an increase in length
and a gain of twenty-five to forty per cent. in weight. The conclusion
seems unavoidable that the adult salmon do not enter the Penobscot for
spawning oftener than once in two years.

The method of impregnation employed has always been an imitation of the
Russian method introduced into America in 1871. The eggs are first
expressed into tin pans, milt is pressed upon them, and after they are
thoroughly mixed together, water is added. The result has been
excellent, the percentage of impregnated eggs rarely falling so low as
95.

After impregnation the eggs are transferred to the hatchery at Craig's
Pond Brook, where they are developed, resting upon wire-cloth trays in
wooden troughs, placed in tiers ten trays deep, to economize space, and
at the same time secure a free horizontal circulation of water.

The hatchery is fitted up in the basement of an old mill, of which
entire control has been obtained. The brook is one of exceptional