The mineral content of Illinois . LEGEND PAI^T5 PER MILLION• — 300L 3O0~4001 400-500+ 500-600 t eoo-\oooA looo-aooo3<^ aooo+ Residue in water of deep drift wells. STATE GEOLOGICAL SURVEiY. 45BULL. NO. 10, PLATE LEQE/SD PART5PERMILU0H • O - 5 o 5 - lO + 10-20 A Z0-50 ^ 50-100 a 100-500 Ik 500 + Chlorine in water of deep drift wells 46 STATE GEOLOGICAL SURVEY. T BULL. NO. 10. PLATE r

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