Abstract: A feeding device and feed storage hopper for laboratory rats, adapted to be hung from the top and inside the animal cage, comprises a substantially rectangular feed chamber containing an open top and a downwardly sloped back panel. A generally U-shaped "floating" wire screen overlies a rectangular opening in the lower front face of the rectangular feed box and is rigidly attached to the feed box to cover the opening therein except along the bottom edge of the screen. Feed which is to be ingested by the rat rests on the face of the wire mesh screen which has been designed in a manner that the weight of the feed is forced to collapse onto the screen surface as the animal consumes the feed, thus providing a continual flow and availability of feed to the rat.

Abstract: Laboratory apparatus for cloning mammalian cells includes a support plate and a plurality of tubular cylinders fixedly secured within the plate and projecting from one face thereof. All of the cylinders, with the exception of one pair, are disposed within a concentrated array defined within a predetermined sector region of the plate, the remaining pair of cylinders being located remote from the sector array yet equidistantly spaced from each other and from the sector array so as to complete the distribution pattern. A substantially C-shaped ring member is fixedly secured to, or integrally formed with, the opposite face of the support plate, in order to facilitate maneuverability of the assemblage when placing the same onto a Petri dish for isolating the colonies developing thereon. The plate and ring member are fabricated from transparent polycarbonate in order to permit the colonies to be identified or viewed by background lighting techniques.

Abstract: A feed hopper for the cage of a laboratory mouse comprises a substantially rectangular parallelepiped feed chamber containing an open top. A wire mesh base screen is affixed to at least one front surface of the chamber, having a top portion of the wire screen fastened at an angle with respect to the plane of that front surface, and a bottom portion of the screen parallel to the plane of the open top of the feeder. Feed which is to be ingested by the mouse rests on the base wire screen which has been designed in such a manner that the weight of the feed is forced to collapse as the animal consumes the feed, thus providing a continual flow and availability of feed. Furthermore, the sides of the wire mesh openings are such that commercially available, autoclavable mash feed could be used. The mouse feeds by moving its tongue over the screen to pick up food particles thereon.