''This Act extends only to such areas as the President of the Union may. by notification, direct. In this Act, the expressions “inspector” and “veterinary practitioner ” mean, respectively, the officers appointed as such under this Act, acting within the local limits for which they are so appointed. The provisions of this Act in so far as they relate to entire horses shall, if the President of the Union by notification so directs, apply also to entire asses used for mule-breeding purposes- . The President of the Union may. by notification, make such orders as he thinks fit directing and regulating the registration of entire horses main, tained for breeding purposes...''