Abstract: A Leighton tube assembly designed for the growth of tissue cultures and their preservation comprising a tube, a cover slip and a means to close said tube. The tube, made from two injection molded pieces welded together, has a chamber toward its closed end and a neck towards its open end. The chamber has a wall with a flat portion which is separated from the open end of the tube by a dam located in the neck. The cover slip is molded of a plastic material which is both transparent and inert with respect to most chemical solvents. The cover slip has a culture segment which lies on said flat portion of the chamber wall when the slip is in its growth position and a handle. The handle is of a length which allows the positioning of a cap over the open end of the tube.

Abstract: A picture display device includes a plurality of generally rectangular frames hinged together, edge-to-edge in an endless series. The frames can be folded into an arrangement defining a compact pack from which a pair of frames project in an inverted-V display position. The assembly of frames is detachably mountable to a support device and in a manner in which manual rotational movement of the upwardly projecting pair of frames from the display position back toward the pack automatically raises another pair of frames to the display position.

Abstract: A tissue culture cluster dish, having a lid which may be removably placed on a base having formed in it a plurality of wells for the placement and growth of tissue cultures; the wells having well bottoms which are transparent and flat for easy viewing of the well contents, the well bottoms being elevated above the plane in which the base makes contact with any horizontal planar surface upon which the base is placed; the base having ribbing which extends below and surrounds the well bottoms, the base further having a base rim of sufficient vertical extend for easy grasping and holding; the lid coming in contact with and being supported by the base only through protrusions upwardly extending from the base, thereby assuring atmospheric communication between the well interiors and the outside of the dish; the lid having ridges to prevent transfer of moisture from the area above one well to that above any other well; and the lid fitting on the base only in one orientation.