REPORT OF COMMISSIONER OF FISH AND FISHERIES. 143 
ake and the upper part of the Sevier River. In all streams like the 
latter occurring in this basin Dr. Jordan considered that catfishes might 
be planted to good advantage. 
In connection with his description of the many mountain trout ob- 
Bexved, Dr. Jordan defines carefully the several varieties or subspecies 
which he now recognizes, numbering 10 in all. One of these, a new 
and large variety from the Twin Lakes, has been named Salmo mykiss 
macdonaldi, in honor of the U.S. Fish Commissioner. Five of the varie- 
ties mentioned were collected in Colorado and Utah, and nine have 
been figured in his report. 
; MISSOURI AND ARKANSAS. 
_ The investigations in these two States, which had been planned for 
1888, were taken up in the summer of 1889 by Prof. S. HE. Meek, of Coe 
College, Iowa, assisted by Mr. Louis Rettger and Mr. Frank M. Drew, 
‘of the Indiana University. The operations of this party were chiefly 
limited to the Ozark region of southern Missouri and northern and 
western Arkansas, in the midst of which, at Neosho, Mo., a hatching 
station was in course of building by the U.S. Fish Commission. The 
surface of the country in this region is much broken, although none of 
the hills reach a very great height. Springs abound and the streams 
are clear and cold even during midsummer. The bottoms of the latter 
are rocky, gravelly, or sandy, with little mud, and aquatic vegetation is 
‘not abundant. Fishes were plentiful in nearly all of the rivers in Mis- 
‘souri that were visited, but they were scarce in the Mazarn, and espe- 
cially so in the Caddo and the forks of the Saline. It was reported that 
large numbers of fishes had been killed in the latter streams by the use 
of dynamite, and also in the neighborhood of Newburg, Neosho, and Ca-. 
bool, Mo. Were this pernicious practice of destroying the native fishes 
to be continued, fish-cultural operations could not have much effect in 
replenishing the supply, but it is hoped that measures may be taken to 
prevent it in the future. In the Missouri River basin the Meramec, 
Gasconade, and Osage rivers were examined; in the Arkansas basin, 
Neosho River and Spadra Creek; in the White basin, White River, 
the tributaries about Mammoth Spring, and Little Red River; and in 
the Washita basin, Washita, Caddo, and Saline rivers and Mazarn 
reek. § 
Mammoth Spring, ar mean is one of the largest springs in the 
‘United States, flowing about 50, 000 cubic feet of water per minute; the 
temperature of the water ranges from 59° to 62° F., throughout the 
year. <A fish farm has recently been established at this place, and in 
(1889 they began the rearing of trout which are said to grow rapidly, 
the conditions being exceedingly favorable for that purpose. The U.S. 
‘Fish Commission hatchery at Neosho is situated on a branch of the 
Neosho River and is fed from a fine spring. The station, however. had 
ese 
