Cutting the Bark to Receive a Bud
A T-shaped incision is made in the bark of the stock on which the bud is to be grafted, and the edges about the vertical slit are turned back, exposing the cambium layer. The slice of bark with the bud is then slid into this pocket, and the bark of the stock is folded about it and secured with a string.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 3 Chapter 5