Luther Burbank, his methods and discoveries and their practical application; prepared from his original field notes covering more than 100,000 experiments made during forty years devoted to plant improvement . lso apple withquince, and quince with pear. Stone fruit withstone fruit, that is to say, and seed fruit with seedfruit—but never stone fruit with seed fruit. In a word, the possibility of cross-fertilizationbetween species is conditioned on a certain close-ness of relationship, which we speak of as affinity. This, as the evolutionist teaches us, is a matterof actual genetic relationship.
Luther Burbank, his methods and discoveries and their practical application; prepared from his original field notes covering more than 100,000 experiments made during forty years devoted to plant improvement . lso apple withquince, and quince with pear. Stone fruit withstone fruit, that is to say, and seed fruit with seedfruit—but never stone fruit with seed fruit. In a word, the possibility of cross-fertilizationbetween species is conditioned on a certain close-ness of relationship, which we speak of as affinity. This, as the evolutionist teaches us, is a matterof actual genetic relationship. All members ofthe rose family, for example, have branched fromthe primal ancestral stem at a period much morerecent than that at which the common ancestorof the present-day apple and rose and blackberrybranched from the primal stock of, let us say,the oaks. In the broadest view, there is a cousinshipbetween all species of plants; just as there isrelationship between all the twigs of an actualtree. But the species of an existing genus maybe likened to twigs on a single branch; othergenera representing different branches whichmay diverge in opposite directions, and only cometogether at the trunk. [40]. Corn Tassels Bearing Kernels Among the most interesti7ig of Mr. Burbanks experiments with corn are those in ivhich the tassel oj the corn, which in the cultivated plant bears pollen only, has been induced to develop pistillate flowers and seeds. This is a reversion to the ancestral jorm in ivhich the seeds were borne at the tip of the stalk, as is still the case with inost other grasses. LUTHER BURBANK Then, too, there is a time element involved. Species that are closely similar in appearanceare those that have branched from the ancestralstem in relatively recent epochs; species moredistinct trace their cousinship through remoterlines; and forms so widely diverse as to be placedin different orders have been separated for stilllonger periods. And we must suppose that ineach gener
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