Quarantine with a disinfecting stove, have a right to navigate the Canal, in quarantine, subject only to the landing of those who were suffering from plague. Plain yellow, green, and even black flags have been used to symbolize disease in both ships and ports, with the color yellow having a longer historical precedent, as a color of marking for houses of infection, previous to its use as a maritime marking color for disease. The present flag used for the purpose is the "Lima" (L) flag, which is a mixture of yellow and black flags previously used. It is sometimes called the
Flag of Australia 1924 agreement that the Union Flag should take precedence as the National Flag with state and local governments henceforth able to use the blue ensign. As the Union Flag was recognised as the National flag, it was considered disloyal to fly either ensign without the Union flag alongside, and it was the Union Flag that covered the coffins of Australia's war dead. In 1940 the Victorian government passed legislation allowing schools to purchase Blue Ensigns, which in turn allowed its use by private citizens. Prime Minister Robert Menzies then encouraged schools, government building and private citizens to use the Blue