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of the hills are a few ferns, lady-fern, maiden-hair and brittle bladder 

 fern (C. frufjilis). In general, however, the delicate wood ferns are not 

 abundant in this region. Mitella diphijlla fringes the slope of the hills 

 here and there. Both in this gully and at places in the lake plain, as the 

 southern end of the Assembly grounds, are soggy hills covered with a 

 gTowth of sedges, shrubby five-finger, gi'ass of parnassus, and so on. 

 Numerous springs issue from these hills. In the bottom of the gully, and 

 near the creek itself, is an abundance of swampy ground, with Sagittarias 

 and other marsh plants. Here Is an abundance of the liverwort, Cono- 

 cephalus. 



One dry hillside along this gully is completely covered with hounds- 

 tongue. The hillsides from which springs issue bear in places large patches 

 of horse-mint (Monarda fistiilosa) and are made purple in August by 

 masses of iron- weed in bloom. 



The upper part of the gully of Clear Creek is different both in appear- 

 ance and flora, from that of Cherry Creek. Hei'e the creek cuts its way 

 thi'ough hills of sand and gTavel. The bottom of the tolerably wide gully 

 is mostly sandy soil, and the creek bottom is solid and often contains sand- 

 bars and gravel-banks. The different slopes have a somewhat different 

 flora. There are a few large basswood trees, and some beech and a few 

 box-elder on the east side. On the slope on this side ai-e found rock cress, 

 BlcpJiiUa, nettles, beech-drops, and so on. On the west side of the gully 

 were found spice bushes, Celastrtts scandens, or climbing bitter-sweet, 

 hedge hyssop, tall scouring rushes, blood-root, celandine poppies, re- 

 mains of trillium, wood anemones, dutchman's breeches, and the like. 



The sides of the outlet, where there is a broad marshy region without 

 any pronounced gully, showed no plants different from those common to 

 the region, except there was an especial abundance of the reindeer lichen, 

 Cladonia rangiferhia. There is here a broad, densely overgrown, swampy 

 tract, full of willows. 



At different places between the sand hills and the lake are the loio 

 ground forests, the bottoms of which seem to be slightly higher than the 

 surface of the lake plain itself. One of these forests is to be found in the 

 vicinity of the laboratories and another down along Clear Creek. This 

 forest differs considerably fi'om the high-ground forest in both soil and 

 vegetation. The soil is a rich, black, sandy loam. The trees are burr oak, 

 ash, aspen, willow, elm, plum, and so on. At the junction between the 

 low-ground and high-ground forests we have at one place, near Chicago 



