immediate vicinity, and the rest from a very pure lake half a mile
distant. The water derived from the lake was thoroughly aerated by its
passage over a steep rocky bed. The transparency of the water in the
pond was so great that a pin could be seen at the depth of six feet.

This inclosure was a complete failure. The salmon placed therein were
after a day or two attacked by a parasitic fungoid growth on the skin,
and in a few days died. Out of 59 impounded not one escaped the disease
and only those speedily removed to other waters recovered. Several,
removed in a very sickly condition to the lake supplying the brook,
recovered completely, from which it is safe to infer that the cause of
the trouble did not lie in the lake water.

Of the spring water I have some suspicions, and should not dare to
inclose salmon in it again.

No. 2. After the failure of the above experiment an inclosure was made
in the edge of an ordinary lake by stretching a stout net on stakes.
This water was brown in color, and objects 4 feet beneath the surface
were invisible. The bottom was gravelly and devoid of vegetation.

The depth was 7 and one half feet in early summer, and about 4 feet
after the drought of August and September. The area inclosed was about
25 square rods in June, and perhaps half as much at the end of summer.
This inclosure was entirely successful, very few salmon dying in it
except those that had been attacked by disease before their
introduction, and all the survivors were found to be in first-rate
condition in November. This site was not afterwards occupied, because
it was inconveniently located, and was exposed to the full force of
violent winds sweeping across the lake, and therefore unsafe.