MOUND-BUILDERS AND PLATYCNEMISM IN MICHIGAN. 387 



an agricultural people, and largely dependent on cereals for sustenance, 

 grain-lbod was transported to the island in sufficient sup])ly from a 

 more southern latitude. The so-called "Garden-beds," covering so wide 

 an area of the Saint Joseph Eiver and Grand River Valleys, Michigan, 

 as well as similar grounds of other places, demonstrate the agricultural 

 habits of the ancient people of this region. The remains of those cul- 

 tivated fields also afford a clue as to the source of the chief part of the 

 supplies required for the mining adventures in the northern country. 



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Of the excavations on the small islands lying off Isle Eoyale, an 

 interesting example was discovered by me on the rocky islet which, for 

 the purj)ose of distinguishing it, I have named, from its general outline, 



