Abstract: An apparatus for processing biological materials, the apparatus comprising a plurality of stacked, rotatable platforms, each platform having a plurality of sample receiving areas located thereon. The apparatus has a first dispensing member mounted for dispensing reagent and/or a sample to a sample receiving area on a first stacked platform and a second dispensing member mounted for dispensing reagent and/or a sample to a sample receiving area on a second stacked platform. Each platform is rotatable to move sequential sample receiving areas into orientation with the mounted reagent dispensing member to receive reagent therefrom.