Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . Fig. 106. Pin Centre. undoubtedly a richer appearance, a polyanthus isnot considered by the florists to be worth growingif it have a phi Fig. 107. Rose Centre. But, for the botanist, there arise some rathercurious speculations with regard to rose centres andpin centres. Thus, the primrose is apparentlybranching off into two distinct varieties; will the gulf widen, and there be at last two species ?Or, do the pin-centred flowers show a tendency tolose their stamens, and the
Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . Fig. 106. Pin Centre. undoubtedly a richer appearance, a polyanthus isnot considered by the florists to be worth growingif it have a phi Fig. 107. Rose Centre. But, for the botanist, there arise some rathercurious speculations with regard to rose centres andpin centres. Thus, the primrose is apparentlybranching off into two distinct varieties; will the gulf widen, and there be at last two species ?Or, do the pin-centred flowers show a tendency tolose their stamens, and the rose centres theirpistils, and the primrose become eventually dioe-cious ? Again, referring to the figures, it will be evidentthat in the rose-centred flower the pollen will natu-rally fall from the stamens on to the pistil, and itwill thus be self-impregnated. In the pin-centredflower, the pistil is in such a position that itcannot be fertilized by pollen from its own sta-mens, and it must depend upon insects bringingpollen to it from other flowers. Darwin says thatthe seeds of self-impregnated flowers do not pro-duce such robust plants as seed that has beenfertilized by pollen from another individual. If thisbe the case, and if a struggle for life
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
