This is allied to "inarching," in which the cion is left upon its original root until the union is made, the plant from which the cion is to be taken being planted close to the one that is to serve as the stock. The two are brought together, and the bark sliced from a branch of each so that the cambium layers come in contact. After union, the stock is cut above and the cion below, thus leaving the cion on a new stock.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 3 Chapter 5