“Now, the presumption of law is in favour of joint tenancy, unless there are clear words of severance in the instruments or they could be inferred. Where property is given to several persons concurrently, the question whether these persons take as joint tenants or as tenants in common, depends on the contents of the instrument. They prima facie take as joint tenants-Stuart v. Bruce (1798) 3 Yes. 632: Crooke v. De Vandes (1802) 9 Yes. 197, 204.”