I just came across an ad for "Water & Air-Proof Beds, Cushions, Pillows, &" sold by H. Francis and Co., dispensing chemists and manufacturing wholesale and retail druggists in Melbourne, Australia. The ad appeared in the front matter of a short book, THE STORY OF WILLIAM BUCKLEY THE RUN-AWAY CONVICT WHO LIVED 32 YEARS AMONG THE BLACKES OF AUSTRALIA published in 1889 in Australia. I'm not sure what water and air-proof beds were. Any ideas?