“I give to the Heart Research Institute, 7 Eliza St, Newtown NSW 2042, ABN 41 003 209 952, (a percentage), or (a specific sum or piece of property), or (my whole estate) or (the residue of my estate) free from all duties to be used for the general purposes of the Heart Research Institute. A receipt from the treasurer or other authorised person to my executor shall be a complete and sufficient discharge for the payment of such benefit.”