53 POPULAR SCIENCE MONTHLY 
Fic. 5. Tuomas Nurrat.; from TEE Popunar Scmmncre MonTuty, Vol. 46, 1895. 
in the spring of 1811 the two made the journey up the river to the 
Mandan villages, as previously described in this paper. Both natural- 
ists were more than once in extreme danger, but Nuttall brought back 
with him many treasures of seeds, plants and other objects of interest. 
The next eight years he remained at Philadelphia, studying in the 
winter the collections which he made during his summer excursions to 
various parts of the country east of the Mississippi, from the Great 
Lakes to Florida. At about this time he was preparing the manuscript 
