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23. Wailes, G. H., 1912. Some Desmids from Alpine Stations in Colo- 



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24. Webber, H. J., 1889. Catalogue of the Flora of Neb. Report of the 



Neb. State Board of Agric. Lincoln. 



25. Webber, H. J., and Bessey, C. E., 1892. Appendix to the Catalogue 



of the Flora of Nebraska, with a Supplement of Recently Re- 

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26. Whipple, G. C, 1914. The Microscopy of Drinking Water. Cam- 



bridge. 



27. WOLLE, F. W. 1886. Fresh-water Algae of the United States. Beth- 



lehem. 



28. 1884. First Contribution to the Knowledge of Kansas Algae. 



Bull. Washburn Lab. of Nat'l Hist., Vol. I, No. 1. Topeka. 



29. 1885. Second Contribution to the Knowledge of Kansas 



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30. 1886. Third Contribution to the Knowledge of Kansas Algse. 



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31. 1889. Fourth Contribution to the Knowledge of Kansas 



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These drawings were made by the aid of the camera lucida. 



PLATE II. 



Gleocapsa arenaria X 750 



Merismopedium glaucum X 520 



Oscilliatoria tenuis X 750 



Oscilliatoria amphibia X 750 



Oscilliatoria brevis X 1000 



Spirulina major X 750 



Lyngbya putealis X 400 



Hypheothrix coriaceae X2200 



Anabaena variabilis X 750 



Anabsena flos-aquae X 750 



Dinobryon setularia X 750 



Euglena viridis X 1500 



Conferva utriculosa X 600 



