20 Proceedings of the Ohio State Academy of Science. 



Journal and Orchard Islands and extending to the sb(jre, the 

 swamp shows well defined zonation. The outer zone is an al- 

 most pure growth of Nehtmbo lutea in water from 4-5 feet 

 deep. Next is a mixed zone of Xelumbo lutea and Polygonum 

 emersum. The latter becomes dominant nearer the shore. This 

 is bordered by a dense growth of Typha latifolia with which 

 Sparganium eurycarpum, Polygonum emersum and sedges are 

 associated. The Typha zone begins in water two and one-half 

 feet deep and extends up above the water level on the mud flat. 

 This is followed by an Hibiscus zone, and this in turn by a thin 

 fringe of shrubs. Samb'ucus canadensis and Cornus stolonifera. 

 The trees, remnants of the older vegetation, are mostly Salix 

 nigra. There is here and there an Ulmus americana and Hicoria 

 ovata. 



The outline of the south shore is very irregular. The hills 

 to the south form a front of irregular lobes 900 feet above sea 

 level extending to near the water's edge. Between these lobes 

 are the valleys of brooks, many of which are now mere depres- 

 sions in the cultivated fields, a few are still occupied by small 

 streams. The lake has ascended these valleys forming troughs 

 between the lobes of higher land. As the water in these coves 

 is extremely shallow they are all filled with a dense growth of 

 fixed aquatics and shore marsh plants. The mouth of the valley 

 of Buckeye Creek is an almost impenetrable marsh, three- 

 fourths of a mile wide from Custer's Point to its eastern mar- 

 gin back of Buckeye Point. This is the most extensive con- 

 tinuous association of fixed aquatics in the lake. The marsh 

 extends out into the lake as far to the west as Custer's Point 

 and Elm Island and nearly half way across the lake to the 

 north. It completely surrounds Charleston and Lewis Islands, 

 and an island just west of Buckeye Point and also forms a broad 

 zone around the latter. The greatest depth of water is five and 

 one-half feet. At this depth, at the lakeward margin of the as- 

 sociation, occur pure societies of Xehmibo lutea, Potamogeton 

 lonchites, mixed societies of several species of Potamogeton 

 lonchites, pectinatus and natans, and often with Castalia tube- 



