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in the Chair. 1 The discussion upon this Paper waa taken in conjunction with that upon the two following ones, and was continued over portions of four evenings, but an abstract of the whole is given consecutively. [1874-75. N.S.] B Downloaded by [ UNIVERSITY OF IOWA LIBRARIES] on [15/09/16]. -7 Downloaded by [ UNIVERSITY OF IOWA LIBRARIES] on [15/09/16].doi:10.1680/imotp.1875.22672 fatcat:3otp4orzjbe5pcbtvyms52z53m