EMIGRANT DIAMONDS IN AMERICA. 



81 



points wliere the several tracks marking their migrations eon- 

 verge upon one another, and the former summit of the ice sheet. 

 The broader the " fan " of their distribution, the nearer to the 

 latter must the point be located. 



It is by no means improbable that when the barren territory 

 about Hudson Bay is thoroughly explored a region for profitable 



CouMOK Forms of Quartz 

 Crystals. 



CoiiMON Forms of Diamonds. The African stones 

 most resemV>le the figure above at the left (octa- 

 hedron). The Wisconsin stones most resemble 

 the figure above at the right (dodecahedron). 



diamond mining may be revealed, but in the meantime we may 

 be sure that individual stones will occasionally be found in the 

 new American homes into which they were imported long before 

 the days of tariffs and ports of entry. Mother Nature, not con- 

 tent with lavishing upon our favored nation the boundless treas- 

 ures locked up in her mountains, has robbed the territory of our 

 Canadian cousins of the rich soils which she has unloaded upon our 

 lake States, and of the diamonds with which she has sowed them. 



The range of the present distribution of the diamonds, while 

 perhaps not limited exclusively to the " kettle moraine," will, as 

 the events have indicated, be in the main confined to it. This 

 moraine, with its numerous subordinate ranges marking halting 

 places in the final retreat of the ice, has now been located with 

 sufficient accuracy by the geologists of the United States Geo- 

 logical Survey and others, approximately as entered upon the ac- 

 companying map. "Within the territory of the United States the 

 large number of observations of the rock scorings makes it clear 

 that the ice of each lobe or glacier moved from the central portion 

 toward the marginal moraines, which are here indicated by dotted 

 bands. In the wilderness of Canada the observations have been 

 rare, but the few data which have been gleaned are there repre- 

 sented by arrows pointed in the direction of ice movement. 



There is every encouragement for persons who reside in or 

 near the marginal moraines to search in them for the scattered 

 jewels, which may be easily identifi.ed and which have a large com- 

 mercial as well as scientific .value. 



VOL. LVI. 1 



