. Biology in America. Biology. 12K) /iinio;/)/ ill Aiiirrica j)le filed by Darwin. Si ill other iiislaiiees are tiiose of liorn- less eatlle, hairless clogs, l)oi)-tailecl cats, web-footed chiekens and extfa-finjrered men. These however are exceptional cases; the <i:reat mass of mntations, tliose mainly productive of evolution, are of the minor sort, appreciable only by care- ful measurement and statistical analysis. The presentation of the mutation theory in its present form we owe nuiinly to tiie Dutch botanist, DeVries. A brief resume of the hitter's work will bring the subject fairly be
. Biology in America. Biology. 12K) /iinio;/)/ ill Aiiirrica j)le filed by Darwin. Si ill other iiislaiiees are tiiose of liorn- less eatlle, hairless clogs, l)oi)-tailecl cats, web-footed chiekens and extfa-finjrered men. These however are exceptional cases; the <i:reat mass of mntations, tliose mainly productive of evolution, are of the minor sort, appreciable only by care- ful measurement and statistical analysis. The presentation of the mutation theory in its present form we owe nuiinly to tiie Dutch botanist, DeVries. A brief resume of the hitter's work will bring the subject fairly be-. iN 1 example of mu Poulry, " Carncyie Instil u1 ion, PuliKcation A RuMPLESs Fowl ton. J''roiii l)a\ i'n|iort, No. Inherit a nt-e in fore us. Over thirty years ago DeVries found certain well- marked varieties of the evening primrose, a native of Amer- ica, which had been introduced into Pairope and was grow- ing as a weed around the city of Amsterdam. Specimens of these varieties and of the parent species were transplanted in his garden and bred for many years including eight gen- erations, during wdiich time he discovered and recorded over 800 variations from the parent type, whose possessors bred true to themselves. By selection of these variations he was able to produce a large number of distinct types of prim- rose which he called "elementary species,". 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 Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger
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