zenus was attacked by a mob in his hotel, and rescued 
by the Governor of the State, who sent him with 
some other Americans to Cosihuiriachi, a little town 
in the mountains about ninety miles west of Chihua- 
hua. He was permitted, on parole, to wander during 
the day not more than two leagues from the town. 
During this enforced stay he was indefatigable in 
gathering scientific information on various topics. 
After six months, American victories brought liberty 
to the prisoners at Cosihuiriachi. They left for Chi- 
huahua—no one saying them nay—and there found 
Doniphan’s Missouri Regiment. Wislizenus received 
an appointment as surgeon, and on the journey toward 
home made such scientific investigations as his medi- 
cal duties permitted. 
Among those who were interested in his trip was 
Senator Benton of Missouri. At his instance the 
United States Senate printed five thousand copies of 
Wislizenus’ journal, together with accompanying 
tables and maps. The scientific interest of the publi- 
cation is further enhanced by Dr. Engelmann’s report 
on the flora of the trip, based on specimens collected 
by Dr. Wislizenus. A great part of the trip had 
been through territory which had no prior scientific 
exploration. Much of the scientific investigations re- 
ported in this ‘“Tour through Northern Mexico”’ has 
been superseded by later work in detail; but such sub- 
sequent work has served to emphasize the reliability 
of this first observer. Humboldt speaks apprecia- 
