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Optical spectroscopic studies of emission lines in black-hole candidates canhelp us investigate state transitions in those systems. Changes in the opticalline profiles reflect changes in the geometry of the accretion flow, usuallyassociated with X-ray state transitions in the inner region. We identify atleast four optical states in the black-hole candidate GRO J1655-40 in outburst,and two optical states in GX339-4.Comment: Talk presented at the IX Marcel Grossmann Meeting, Rome 2000--to  appear in the Conference proceeding

THE OPTICAL EMISSION LINES AS A PROBE OF STATE TRANSITIONS IN BLACK-HOLE CANDIDATES