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Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898

Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 238

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1 6 4 8 3 9 5 7 2 7 5 9 3 8 4 6 1 :10 :12 :15 :13 :14 :17 :16 :11 :11 :16 :17 :14 :13 :15 L12 :10 5 3 4 6 2 1 a b Fig. 130. Diagram illustrating Milne-Edwards and Haime's law of septal growth in Hexacoralla, a, Young Corallum with two cycles of septa; b, Corallum with three cycles of septa; c, Segment of calice with six cycles of septa. (The numerals above Fig. C indicate the order of insertion of new septa, The concentric dotted lines mark the beginning and end of the several cycles; the figures on the left indicate the order of cycles, and are placed opposite the line touched by the last septum of a given cycle.)
 
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