. The Canadian field-naturalist. 1966 Brayshaw: What are the Blue Birches? 191 7 iz6 X H- Z ^ UJ 4- 2-. 10 ATTENUATION 20 FACTOR: a/m Figure 2. Modified scatter diagram of the populations of Betula caerulea and B. caerulea- grandis, showing their relation to those of B. papyrifera and B. populifolia (outlined). expression of a species in each specimen could be summed (ibid.). As indicated in Figure 1, the ideal pure specimen of B. papyrifera should have an index value of 0 or 1 and the ideal pure specimen of B. populifolia should score 12. Deviations of up to two or three points
. The Canadian field-naturalist. 1966 Brayshaw: What are the Blue Birches? 191 7 iz6 X H- Z ^ UJ 4- 2-. 10 ATTENUATION 20 FACTOR: a/m Figure 2. Modified scatter diagram of the populations of Betula caerulea and B. caerulea- grandis, showing their relation to those of B. papyrifera and B. populifolia (outlined). expression of a species in each specimen could be summed (ibid.). As indicated in Figure 1, the ideal pure specimen of B. papyrifera should have an index value of 0 or 1 and the ideal pure specimen of B. populifolia should score 12. Deviations of up to two or three points from these ideals can be expected as an expression of the natural range of individual variation within either species. In the scatter diagram, a pure B. papyrifera specimen should be represented as an unappendaged spot in the upper left hand portion of the diagram, while. 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 Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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