500 Wisconsin Academy of Sciences, Arts, and Letters. 
TABLE! 1. DEPTHS IN METERS AT WHICH DIFFERENT SPECIES ARE FOUND 
0 1 5 3 4 5 0 
1. Potamogeton pectinatus .. 
2. Potamogeton zosterifolius ..... - 
3. Potamogeton Richardsonii . —- 
4. Potamogeton lucens .. 
5. Potamogeton alpinus . . 
6. Potamogeton amplifolius . . 
7. Najas flexilis ... 
8. Vallisneria spiralis . —•-- 
9. Ceratophyllum demersum -- 
10. Myriophyllum verticillatum 
var. pectinatum ............. ---- 
11. Scirpus validus . . — 
12. Elodea canadensis . ... 
13. Ranunculus aquatilis .. 
14. Nymphaea advena ... 
15. Cast alia odor at a . ——— 
16. Chara sp..—— 
17. Lemna minor . .. 
18. Lemna trisulca .. 
19. Cladophora sp... 
20. Woljfia columbiana . . 
21. Utricularia vulgaris 
var. americana . . 
References 
l c Pieters, A. J. The plants of Lake St. Clair. Bull. Mich. Fish Comm. 
2. 1894. 
2. West, G. S. Flora of Scottish lakes. In “Bathymetrical survey of 
the fresh water lochs of Scotland” 1: 166. 
3. West, G. S. (Above cited) 1: 162. 
4. Warming:, E. Oecology of plants (Eng. transl.), p. 150. Oxford, 
1909. 
5. Pond, R. H. The larger aquatic vegetation. In Ward and Whip¬ 
ple “Fresh-water biology”, p. 19 6. 
6. West, G. S. (Above cited) 1: 164. 
7. Magnin, A. Contributions a la connaissance de la flore des lacs 
du Jura. Bull. Soc. Bot. France, 41 : CXXV. 1894. 
