This invention provides joining methods of single veneer piece and a joining apparatus, which can produce more efficient, and effective joining process than the conventional method and apparatus produce. In particular small differences in effects produced by unfocused and focused stimulation at each of the locations tends to indicate good survival at those locations and conversely large differences in effects of focused and unfocused stimulation at a given location indicate poor survival at that location. The first guide comprises a horizontal, first portion adjoined in an inward direction of the luggage compartment by a second portion, which extends obliquely upwards from the level of the first portion. The guide member is adapted to be slidable along a tissue surface in atraumatic sliding engagement with the discharge bore opposing the surface.