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True hybrids between species may arise in quite the same way, and since it is obviously impossible to attribute them to an innate tendency to reversion, they afford an absolutely irrefutable proof of the assertion that pollen is often brought by insects from one lot of plants to another. In this way I obtained a hybrid between the common Jacob's ladder and the allied species Polemonium dissectum.
It evidently belonged to the group of sporting varieties already referred to. All others came absolutely true to type without any exception. The species experimented with, were Campanula persicifolia, Hyssopus officinalis, Lobelia syphilitica, Lychnis chalcedonica, Polemonium dissectum, Salvia sylvestris and some others.
We may well close the book, alarmed at the slough of the imbecility whence the art of healing has come down to us. In the midst of these imbecilities, the preludes of medicine, we find a mention of the "fuller." Tertium qui vocatur fullo, albis guttis, dissectum utrique lacerto adalligant, says the text.
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