. Elementary biology; an introduction to the science of life . Fig. 143. jNIechanical protection of seeds /, bitternut {Hlcoria minuna), of the walnut family ; 2, chestnut oak {Qiicrcus priiuts): j, sweet gum {Liguidambai- styracifliia), of the witch-hazel family; 4, table-mountain pine {Piniis pioigens)

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Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology