to this juncture as collector wheel 28 is rotated slots 30 are displaced such that the radially interior opposite ends thereof are placed in communication with duct 40 fig3 with constant negative pressurization of fitting 44 granular material is forcibly drawn from hopper 62 into the slots as they so communicate with duct 40 as the collector wheel is rotated counterclockwise from its fig3 position material containing slots thereof are displaced downwardly outwardly of the hopper entrance opening and the contained granular material is retained in place in the slots by action of shoe 76 whose arcuate surface 76a is of like curvature to that of the collector wheel periphery and is quite closely disposed relative thereto as each material containing slot is further displaced beyond the surface of shoe 76 it is situated both in the aforesaid registration position with a receptor wheel slot and in communication with duct 46 the latter is constantly positively pressurized by air pressure applied to fitting 48 whereby the contents of the collector wheel slot at the registration station are forcibly transferred to the facing receptor wheel slot the receptor wheel slots may alternatively be negatively pressurized by a vacuum fitting at the registration station juxtaposed with lower side surface 60b of the receptor.