1850, a "fibrous tumour was removed from the neighbourhood of the spine". Bird continued to suffer from unspecified ailments resulting in lassitude and insomnia. The family spent six summers in Scotland in an effort to improve her health. Doctors urged a sea voyage and in 1854, Bird's life of travelling began when the opportunity arose for her to sail to the United States, accompanying her second cousins to their family home. Her father "gave her [£]100 and leave to stay away as long as it lasted". Bird's "bright descriptive letters" written home to her relations formed the basis for her first book, An Englishwoman in America (1856), published by Murray. John Murray, "as well as being Isabella's lifelong publisher, ... [became] one of her closest friends". Travels in middle life Bird left Britain again in 1872, going initially to Australia, which she disliked, and then to Hawaii (known in Europe as the Sandwich Islands), her love for which prompted her second book (published three years later). While there she climbed Mauna Kea and Mauna Loa. She then moved on to Colorado, where she had heard the air was excellent for the infirm. Dressed practically and riding not sidesaddle but frontwards like a man (though she threatened to sue the Times for saying she dressed like one), she covered over 800 miles in the Rocky Mountains in 1873. Her letters to her sister, first printed in the magazine The Leisure Hour, comprised Bird's fourth and perhaps most famous book, A Lady's Life in the Rocky Mountains. Bird's time in the Rockies was enlivened especially by her acquaintance with Jim Nugent, "Rocky Mountain Jim", a textbook outlaw with one eye and an affinity for violence and poetry. "A man any woman might love but no sane woman would marry", Bird declared in a section excised from her letters before their publication. Nugent also seemed captivated by the independent-minded Bird, but she ultimately left the Rockies and her "dear desperado". Nugent was shot dead less than a year later. At home, Bird again found herself pursued, this time by Dr John Bishop, an Edinburgh surgeon in his thirties. She got interested in Japan through John Francis Campbell's "My Circular Notes, 1876", and asked the advice of Colin Alexander McVean, former chief surveyor of Japan's Survey Office, in February 1878, then went travelling again, this time to Asia: Japan, China, Korea, Vietnam, Singapore, and