104 BOTANICAL GAZETTE | FEBRUARY 
gravel terrace, or mesa, has an average height of 120 meters 
above the lake level, and an area of more than 2000 hectares, 
since it extends inland for about two kilometers, and along the 
coast for, perhaps, 15 kilometers. The Sleeping Bear itself, 
which gives its name to the point, and also to the bay, is a long | 
established dune, with an altitude of 30 meters above the terrace _ 
on which it stands, or 150 meters above the lake. This dune | 
stands alone, and is a landmark for miles in all directions. 
Farther to the south, dunes are perched upon these bluffs almost 
continuously, and there are reasons for supposing that the Sleep- 
ing Bear is but the last remnant of such a chain of dunes formerly 
superposed on the bluffs near Glen Haven. Toward the east 
and north, as well as toward the lake, the slopes of the mesa- 
like formation are quite abrupt, and beyond these slopes there 
is to be found an extensive dune complex, the grandest in variety 
_ and beauty to be found along Lake Michigan. It seems almost | 
certain that the source of the sand for this dune complex was” ; 
an ancient row of dunes at the top of the mesa toward the west | 
This is made more probable by the fact that the Sleeping Beat, t 
once firmly established, is now being torn up by the winds and 
carried northeastward. The dune complex is moving toward the | j 
east, the line of advance being parallel to the lake shore, & 
usual. This advancing dune is far and away the grandest along 
Lake Michigan, presenting an almost continuous front, measu’ 
ing four kilometers from north to south, all in active progression. 
The average height above the country on which it is encroach { 
ing is about 60 meters, so that it presents a most imposing sight ’ 
when viewed from the fields in front of its line of advance. The 7 
dune complex at Glen Haven is like that at Dune Park, but 
a far grander scale; sometimes there are hollows within it more 
than 30 meters in depth scooped out by the wind, and reaching 1 
down to an ancient beach. Within the dune complex there a F 
extensive old soil lines and many scarred trunks of trees lot 
buried by the dunes and now resurrected, though not to lifes 
At many other places along the northern shore of the 
there are high bluffs of clay, or gravel, whose summits * 
