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Claim 1

IN A HORIZONTALLY SLIDABLE SASHLESS WINDOW CONSTRUCTION, A WINDOW FRAME MADE OF WOOD, TWO SPACED PAIRS OF GLASS PANES ARRANGED WITHIN SAID WINDOW FRAME FOR HORIZONTAL OPENING AND CLOSING MOVEMENTS, THE PANES OF EACH PAIR COACTING TO CLOSE THE WINDOW INDEPENDENTLY OF THE OTHER PAIR, SAID WINDOW FRAME COMPRISING A SILL HAVING A TOP FACE DOWNWARDLY INCLINED TOWARDS THE OUTSIDE OF THE WINDOW FRAME, A SILL TRACK ELEMENT OF PLASTIC COMPOSITION COVERING THE MAJOR PART OF THE TOP FACE OF SAID SILL AND CONSISTING OF TWO PAIRS OF CHANNEL MEMBERS PARALLEL TO ONE ANOTHER, AND EXTENDING THE ENTIRE LENGTH OF SAID SILL, THE CHANNEL MEMBERS OF EACH PAIR BEING CONTIGUOUS FOR RECEIVING THE ASSOCIATED PAIR OF GLASS PANES, SAID SILL TRACK ELEMENT FURTHER INCLUDING A WEB EXTENDING BETWEEN THE TWO PAIRS OF CHANNEL MEMBERS AND INTEGRALLY CONNECTED TO THE UPPER EDGES OF THE ADJACENT CHANNEL MEMBERS OF EACH PAIR WHEREBY SAID WEB IS SPACED ABOVE THE TOP FACE OF SAID SILL, SAID CHANNEL MEMBERS BEING PROVIDED WITH DOWNWARDLY EXTENDING LEGS RESTING ON SAID TOP FACE OF SAID SILL AND SPACING THE BOTTOM OF SAID CHANNEL MEMBERS FROM SAID TOP FACE, THE BOTTOM OF SAID CHANNEL MEMBERS AND THE SAID DOWNWARDLY EXTENDING LEGS BEING PROVIDED WITH DRAIN HOLES, SAID WEB HAVING VENTILATING SLOTS MADE THERETHROUGH, AND SLIDABLE CLOSURES CONNECTED TO SAID WEB FOR ADJUSTABLY CLOSING SAID SLOTS TO PROVIDE ADJUSTABLE VENTILATION IN THE SPACE ENCLOSED BY SAID TWO SPACED PAIRS OF GLASS PANES.