In the schistose grits of the Dalradian Series north of Stonehaven there is clear evidence of the deformation of the rock by shearing of the original quartz grains along planes roughly diagonal to the “flattening”, which here coincides generally with the schistosity of the quartz-schist, the final product of the metamorphism. As this corresponds essentially to the case studied by Schmidt and others, an examination of the rock fabric is made having in mind the mechanism suggested by Schmidt, and more fully elaborated by Anderson, to connect up crystal orientation with deformation. The results of the study do not indicate that the simple model of equal spheres, each with its set of glide planes, and all in cubical packing, is in any way adequate to explain the petrography of this quartz-schist and it is suggested that any theory that makes a purely mechanical reaction of the quartz grains to the deforming forces the dominant factor in the production of a new texture is at variance with the facts since there is clear evidence of the continued solution and crystallization of quartz throughout the whole of the metamorphic period.