A detailed study has been made of the Denigbs colorimetric method for phosphorus. The concentrations of reagents at which phosphomolybdate gives a maximum

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HIS paper is a sequel to the one initially presented on the first stage of occupance of the Calumet region, that of the Pottawatoinie and Fur Trader, T -1830.1 Its purpose is to show how the pioneer settler and his subsistence economy of the period of 1830-50 originally supplemented and then gradually supplanted the occupance forms of the Indian and the French fur trader. It is the second of a series of four proposed papers designed to explore the role that each of four occupance stages successively played in the evolution of the modern Calumet regions2To gain an intelligible time and space perspective of Calumet pioneer regional development, several types of source material and techniques were used: (1) compilation of original land survey; (2) review of relevant historical and contemporary documents and map material (some of it in unpublished form) ; ( 3 ) examination of field evidence in terms of present-day-pioneer-day relationships ; (4) graphic spatial portrayal of as many environmental features as practicable. The environmental elements and their relationships are featured in the form of a master map (Fig. 1) which exhibits the coherent ensemble of basic physical and cultural phenomena, and a sequent occupance chart (Fig. 2) which reveals chronologicchorographic relationships of the landscape elements most germane to our discus-~i o n .~ XAlfred H. Meyer, "Circulation and Settlement Patterns of the Calumet Region of Northwest Indiana and Northeast Illinois (The First Stage of

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