The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . and Oenothera Laniarckiana, the anomalywas reproduced almost every year through the course often ^ One of the best knowninstances is afforded by thesugar-beet, fasciated speci-mens of which can be foundalmost every year in thefields. We frequently findamongst them quite long,broad and wholh^ flat spite of the obvious factthat they are not selectedas seed-parents they recurregularly, and this fact issufficient to demonstratethe heritability of the anom-aly. I have further to men
The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . and Oenothera Laniarckiana, the anomalywas reproduced almost every year through the course often ^ One of the best knowninstances is afforded by thesugar-beet, fasciated speci-mens of which can be foundalmost every year in thefields. We frequently findamongst them quite long,broad and wholh^ flat spite of the obvious factthat they are not selectedas seed-parents they recurregularly, and this fact issufficient to demonstratethe heritability of the anom-aly. I have further to men-tion Plant ago lanceolata,the variety ra//zo^a of whichI have described in detailin the first part of this vol-ume (page 148) and whichI have cultivated every yearsince 1889. It sometimesproduces split ears (), especially amongst the inflorescences which are notbranched at their base, i. e., the atavistic ones. In this ^ Furtlier details relating to this subject and more instances ofthe phenomenon will be found in Oz^cr dc crfclykhcid dcr fasciaticii,Botanisch Jaarboek Gent, 1894, p. ^ Fig. 115. Artemisia fasciated branch which hasbeen heavily bent in conse-quence. 508 The Inconstancy of Fasciated Races. race the anomaly is obviously in the latent condition andonly to a slight extent heritable. N. IMezzana records an instance of a fasciated stemof Ciicurbita Pcpo, the upper part of which gradually be-came broader over about a meter of its length, and wasthickly set with leaves and flowers. The phenomenonwas observed on a number of specimens which had beenraised from seed of the same fruit and Mezzana con-cludes from this fact that the anomaly is ^ Thefact that I have frequently observed such fasciations inmy own cultures of Cnciirbita supports this Artcniisia Absynthinin also, fasciations are sometimesvery common as I observed in 1883 (Fig. 115), 1887,1888, 1889 and 1890, and the phenomenon was repeatedfrom seed in 1889 and 1891.
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