The following bibliography makes no claimto absolute complete ness. The material required was in some instances so difficult of access, that exact data could not-everywhere be given, but most of the entries are based upon personal investigation. Most of the short bibliographies that have hitherto appeared go back directly or in directly to thosevof Denis 1 and Gurlitt,2 both of which are incom plete and not without errors the former contains less than thirty titles that come into question here.