_Mediæval Nomenclature._--In what work is to be obtained the best
information explanatory of the nomenclature of the useful arts in
mediæval times?
[Greek: delta]. {183}
_Sir Christopher Sibthorp._--Can any of your readers furnish me with
information as to the ancestry of Sir Christopher Sibthorp, whose name
appears in the title-page of the following tract: _A friendly
Advertisement to the pretended Catholics of Ireland, by Christopher
Sibthorp, Knt., one of H.M. Justices of his Court of Chief Place in
Ireland_, 1622, Dublin and also as to the crest, arms, and motto borne
by him.