. 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, with the assistance of the Luther Burbank Society and its entire membership, under the editorial direction of John Whitson and Robert John and Henry Smith Williams. asures as these, how-ever necessary, can by no means be regarded assolving the problem of the pear blight. Just asthe surgeon of to-day attempts to prevent the in-trusion of the germs, rather than to depend onkilling them af
. 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, with the assistance of the Luther Burbank Society and its entire membership, under the editorial direction of John Whitson and Robert John and Henry Smith Williams. asures as these, how-ever necessary, can by no means be regarded assolving the problem of the pear blight. Just asthe surgeon of to-day attempts to prevent the in-trusion of the germs, rather than to depend onkilling them after they appear, so the orchardistmust hope to find a means of preventing the blightinstead of being obliged to practice such heroicand wasteful curative measures. One measure looking to this end that has beensuggested is the destruction of old hawthorne andwild crab apple trees and of abandoned pear andapple trees in the neighborhood of the orchard,since a single infected tree would prove a sourceof danger to every tree within a radius of a mileor more. Such measures are important; but they do notgo to the root of the matter. The real solution must come through makingthe tree immune to the attacks of the germ. Thisis the kejTiote of preventive medicine with thehuman subject to-day, as illustrated by the vaccinetreatment, of which the most familiar example is [130]. I.!: ** a ~ a-o 5 O ** C ^ Mm O 1 -, o 3 ;» 1 —s 2 ii2 2:3 S; ^» Q B 3 2 3 • <» a-?^ ^ ®^ 3 «. O -J LUTHER BURBANK Sir Almroth Wrights inoculation for the preven-tion of typhoid fever. It is at least within the pos-sibilities that a not dissimilar inoculation may givethe tree immunity by developing its powers of re-sistance, quite as the human subject is givenimmimity. Of course the tree has no arterial system thatcan be inoculated with hypodermic syringe as thehuman subject is inoculated. But the life of thetree is dependent on the circulation of fluids with-in its tissues
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