Clay Slate
in geology, a rock conand otherwise changed, for the most part extremely fissile and often affording good roofing-slate. In color it varies from greenish or bluish gray to lead color. a CLAYTON-BULWER TREATY, convention between the United States and Great Britain, concluded April 19, 1850, and deriving its name from John M.
Clayton, Secretary of State of the United States, and Sir Henry Bulwer, British Minister at Washington. The object of the treaty was to aid the construction of an inter-oceanic canal on either the Nicaragua or Panama routes.