210 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
spring and early summer tlie temperature is so reduced, even in its hottest, part, as 
to make it possible for fish to pass. 
On the 14th we unloaded our boat for a few hours’ work on Mary Lake, a clear 
and pretty sheet of water lying near the summit of Mary Hill, at an elevation of 
8,200 feet, and we thoroughly examined also the upper waters of Nez Perce Creek 
as we passed down the stream to the Lower G-eyser Basin. The 15tli we spent in 
collecting from the lower part of Nez Perce Creek and from the Magpie, its principal 
affluent, for a short distance above its mouth. Every condition was found suitable in 
these streams for the maintenance of fish, and a report to the Commissioner from the 
field to this effect was followed by a consignment of Yon Behr trout, set free in the 
Nez Perce by Mr. Lucas, of the Commission. 
August 16 was spent on the Firehole River, from the mouth of the Nez Perce to 
the junction of the Firehole and the Gibbon, and the 18th on the same stream above 
the Lower Geyser Basin, our collections ranging from the ford above Old Faithful to 
the Middle Geyser Basin below the Excelsior Geyser. Excellent opportunities were 
given here for a study of the effects of the geyser outflow on the animal life of the 
stream. Some hauls along shore with the surface net were made, in passing, from 
Goose Lake, near the lower basin. 
On the 17th we collected at Canon Creek again, and from the Gibbon River, at 
the mouth of this creek, and also above and below the falls of the Gibbon, well 
known as an impassable barrier to the movement of fishes up this stream. In our 
collections above and below falls in these rivers and creeks, it was my object to learn 
whether' any other animal inhabitants of these streams were similarly excluded from 
their upper waters. 
On the 20th we made atrip from Norris Geyser Basin to the Twin Lakes (in one of 
which whitefish had already been planted by a Fish Commission party), returning by 
a small lakelet without outlet, called the Lake of the Woods. We went thence to the 
Grand Canon, collecting by the way from the Gibbon above Virginia Cascade, and 
from minor waters passed, and on the 22d made a trip to a lake nameless to the guides, 
but marked Grebe Lake by the geologists, and mapped as the source of the Gibbon. 
We carried boat, dredge, small seines, and our lighter collecting apparatus to this 
lake, and thoroughly overhauled it, as typical of its kind. 
Returning to Yellowstone Lake on the 23d, we explored Pelican Creek on the 24th 
for several miles above its mouth, and on the 25tli dredged from two rowboats at a 
depth of 195 feet, with a bottom temperature of 42.5°. Returning next day to the 
canon, we collected from the lower course of Alum Creek, the upper part having been 
explored by us previously. On the 27th, sending the wagon to Mammoth Hot Springs 
by the traveled road, Prof. Linton and I took the trail down the river to Yancey’s 
Ranch, crossing Mount Washburn, and making considerable collections from Tower 
Creek above the fall. On the 28th we went from Yancey’s to the springs, stopping 
by the way at Lava Creek and Blacktail Deer Creek. On the 29th the usual col- 
lections were made from the Madison, at the crossing of the Cooke City road, and 
also from Swan Lake on the plateau of the same name, to which our boat and the 
usual collecting equipment were transported for us by Capt. Bon telle, U. S. A., acting 
superintendent of the Park. 
