Sentence:  CXXV. The Commissioners may license such slaughter-house and <WSD>knacker's yards</WSD>sic as they from time to time think proper for slaughtering cattle within the limits of the special Act. CXXVI. No place shall be used or occupied as a slaughter-house or <WSD>knacker's yard</WSD> within the said limits which was not in such use and occupation at the time of the passing of the special Act, [...] 
Meaning of the word marked with <WSD> tags:  The area of a slaughterhouse where carcasses unfit for human consumption or other purposes are rendered down to produce useful materials such as glue.