. Biologisches Zentralblatt. Biology. Keller, Pädagogiscii-psychometrische Ötudien. 451 Zeit ZZ. Max. 35-40. 30—35. 25-30. 20-25. 10—20. unter 10. ll's 47 40,5 2 4 4 4 2 12 19 12^ 33 31 — - f) 11 4 8 5 155 44 42 5 Fig. 11. 9 Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rosenthal, I. (Isidor), 1836-1915. Leipzig [etc. ] VEB Georg Thieme [etc. ]

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Keywords: ., bookauthorro, bookcentury1800, bookdecade1890, booksubjectbiology